Can I buy samples and return them if they are not suitable?
Yes - just order your samples as desired and then return any unwanted items to our return address and we'll issue a refund.
If you go ahead and place a larger order, we will refund the original shipping costs on the sample order. Just get in touch to let us know if this is the case.
The product I want seems to be out of stock. How can I find out when it's coming back?
If a product is showing as available to purchase on our website, this means that it is in stock and can be dispatched to you imminently.
If the product is available on pre-order, there will be a green pre-order button on the product page with an Estimated Arrival date displayed when hovering over the button.
If a product is not available to purchase, you can also use our "Email when available"" button to sign up for a notification.
You can always email us at firstname.lastname@example.org to discuss questions relating to lead times.
How do I know if Plank Hardware brass colour will match my other brass home accessories?
Our handles are solid brass with a clear lacquer and so should match with other solid brass homewares. You can always order a sample to check, and then return it if it is not suitable.
Can I have a discount for a large order?
We have discounts for new customers signing up to join us. We also have discounts for trade orders and large orders - please visit our trade page or get in touch at email@example.com
Do you offer custom sizes/finishes/designs?
Sadly we can't at the moment, but we are reviewing our range all the time and adding new products, so please keep checking back!
Can I visit a showroom and look at the products?
We are online only at the moment, but you are welcome to order samples and then return them for a full refund if they are not suitable.
I'm ordering handles, how do I know if the screws will be the right size for my cupboards?
All of our knobs and handles are supplied with 25mm M4 machine screws which are suitable for most cupboards up to 20mm thick. For deeper cupboards, we offer screw lengths 30mm, 35mm, 40mm, 45mm. Please just add a note to your order at checkout to let us know which length is best for your project.
If you need to come back to us later on to buy some additional screws, you can shop them here.
Do you offer a trade account/trade discounts?
Please visit this link to apply for a trade account here. Once your account is approved, you'll be able to log in and shop all of our trade prices online.
UK delivery & returns
How long does delivery take?
We aim to dispatch all our orders by the next working day. Your order should be with you within 3-5 working days after dispatch. Dispatch times are currently 1-2 days.
What are the delivery options?
We send orders via Royal Mail & DPD depending on the size and weight of your order. If tracking is available, we will update your order with the tracking number when it's dispatched. If you want to expedite your orders, we do have upgrade options, the options available to you will be visible at checkout.
Can I expedite my order?
Express delivery options will be displayed at checkout at an additional charge. We pack orders on weekdays only, but if you select Express shipping, your parcel will be prioritised for packing and dispatched on our DPD service.
Do I need to wait home for my delivery?
We try to ensure smaller orders for knobs and other small items should fit through your letterbox. However, larger orders will not. If your order is shipped using Royal Mail you'll receive a calling card if you are not home when the delivery arrives.
If your order is shipped using DPD, you'll receive email and SMS updates about the parcel, provided you enter your mobile number at checkout. DPD will provide various options for you to instruct them to leave the parcel in a safe place, or at a designated collection point.
Can I collect my order?
If you are very local to our studio, you can arrange to collect your items. Please get in touch to discuss.
How do I return unwanted items?
Any unwanted items can be returned unused within 60 days of your purchase.
If your parcel is under 20kg, simply visit our online returns portal here.
If your parcel is over 20kg, please get in touch using firstname.lastname@example.org.
Once your returns have been received, we'll check them over
and issue you with a full refund.
Will I have to pay to post the items back to you?
If your parcel is under 20kg, you will be able to generate a free return label using our returns portal here.
If your parcel is under 20kg, please get in touch using email@example.com and we will help you to arrange for the parcel to be returned and we will cover this cost.
Worldwide delivery & returns
Are all products compatible for worldwide installation?
Unless specified under the "add to cart" button, all of our products are compatible worldwide!
How does worldwide delivery work?
If you are shopping with us from another country, when you visit our website you will be able to select to view prices in your home currency by using the flag selector. You may also see some information about our shipping options displayed in the national language of the country you are shopping from.
The prices displayed may include additional amounts to cover taxes and duties applicable to your country, so that you don't have to deal with customs paperwork or make any payments to the local authorities in order to clear your parcel for delivery to you.
At the checkout, when you place your order, you will be transacting with Global-E, our international shipping partner. They will become the merchant of record on the transaction and will handle all of the customs paperwork and any applicable taxes and duties.
You can check out Global-E's terms and conditions here.
What are the worldwide payment options?
Depending on your shipping country, our checkout will show you payment methods available in your location. We do not hold any of your bank details.
What are the worldwide delivery options?
Depending on your shipping country, our checkout will show you our available express and standard shipping options. If you select an express shipping option, the parcel will be shipped to you via DHL. If you select a standard shipping option, your parcel will be shipped to you via a partner courier, this selected courier will vary by location.
How long will delivery take?
Our worldwide orders may take between 3-9 working days after dispatch, depending on the destination and the shipping option selected at checkout. When making your selection, an estimated timeframe will be displayed.
An estimation of the delivery time by location can be found here.
How can I track my international parcel?
You will be provided a tracking link when the parcel has been dispatched. If you have any queries about your order, please contact firstname.lastname@example.org
Can I return my order to the UK?
Will I have to pay to send the items back to the UK?
We may deduct the return shipping cost from your refund amount. However if the unthinkable happens and your goods are damaged or lost, we'll never do this.
I've shopped on another platform like Etsy or one of your partner brands. Can I still return my items?
For Etsy returns, please contact us via Etsy's messaging service or via email@example.com. If you have shopped on a partner brand's website, please contact the brand you have shopped with to arrange your return.
Worldwide taxes and duties
We cover the cost of worldwide taxes and duties, so you'll not have to pay any additional fees after your purchase. Easy, right?
We're proud to say that, as of 2022, Plank Hardware is a carbon neutral business. That means we measure the volume of carbon that our total operation produces, then offset it. Read more about our environmental impact here.
HUMBOLDT Knurled Button Knob - Black
Add texture to your home with our HUMBOLDT Knurled Button Knob — the ergonomic touch you’ve been looking for. It feels hardy in your hands — heavyweight and textured — and is guaranteed to stand the test of time. Tooled from Solid Brass, this knob looks smart and sophisticated on your smooth-faced kitchen cupboards and bedroom wardrobes.
Choose a colour to match your interior design schemes — Brass, Antique Brass, Matte Black, Satin Nickel or Gunmetal Grey — then team with your favourites from our high quality collection of knurled door handles, to complete your DIY home projects.
We’ve made buying and installing nice and simple, as all of our individually-sold knobs come equipped with enough M4 4 x 25mm machine screws.
30mm / 1.18"
34mm / 1.34"
15mm / 0.59"
M4 / 4mm / 0.16"
Each knob comes with M4 4 x 25mm machine screws and is simple to install. If your furniture or door already has a knob or handle on it, you may be able to unscrew the current one and replace it using the existing screw. If not, you will need to drill a small hole (or holes) in your door or furniture and tighten with a Philips screwdriver.
Solid brass with matte black finish.
Clean with warm soapy water and a soft cloth. Avoid abrasive towels, sponges, cleaning sprays, bleach and hand sanitisers.