This is a "made-to-order" bar-shaped type (RDR: hemispherical head) that is manufactured according to the customer's desired screw size, thickness, and length. The knob material is POM (polyacetal), a resin commonly known as Delrin, a product of DuPont. 《 Specifications that can be specified 》 1. Material color (white or black) 2. Receiving screw size (the following 6 types) ① 8 x 1.25mm ② 10 x 1.5mm ③ 10 x 1.25mm ④ 12 x 1.25mm ⑤ 12 x 1.75mm ⑥ 6 x 1.0mm (Please check the dimensions in the dimension table in the figure, as the hole dimensions (HD) differ depending on the screw size) 3. Maximum diameter: D = 32-39mmφ 4. Overall length: L = 121-220mm 5. Distance from the bottom to the screw receiver: LH2 = 0-60mm (If LH2 is not specified (if left to us), LH2 = 10 (mm)) 6. Tapered section length: LT = 0-60mm (If LT is not specified (if left to us), LT = 25-30 (mm)) Please understand that the dimensional tolerance is L: -1.0 to +3.0mm for the overall length, and within ±1.0mm for the others. 《 How to order 》 After completing the purchase process, please contact us via the transaction message section with your desired screw size (① to ⑥), color (white or black), and the desired dimensions (mm) for D, L, LH2, and LT. (Please do not specify your desired specifications in the comment section before purchase. It will be indistinguishable from others and will disappear after the purchase) We will start production after confirming your payment and will ship the product after completion. Delivery usually takes about 1-2 weeks, so please understand. 《 Delivery method 》 Free shipping, but will be via Yu-Packet Plus or regular mail. 《 For those who want a different shape, dimensions, or material 》 If you want to deviate from these standard sizes or if you want to manufacture with a different material, the price will change and it will be a different product. It is prohibited to communicate about different products in the comment or question sections, so please contact us directly through the "Wood Workshop Craft Miya" HP inquiry. First, we will inform you of the feasibility of manufacturing and provide an estimate. (Sending the desired dimension drawings, etc. to the email address listed on the HP cover will help the process run smoothly)