This is a "made-to-order" rod-type (RD: flat head shape) product manufactured according to the customer's desired screw size, thickness, and length. The knob material is POM (polyacetal), a resin well-known under DuPont's brand name: Delrin. 《 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 (The hole size (HD) differs depending on the screw size, so please check the dimensional table in the diagram) 3. Maximum diameter: D = 29-50mmφ 4. Overall length: L = 70-120mm 5. Distance from the bottom to the screw receiver: LH2 = 0～(L-35)mm (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 = 20-30 (mm)) Please understand that the dimensional tolerance is: overall length L: -1.0～+3.0mm, and ±1.0mm for others. 《 How to order 》 After completing the purchase process, please contact us via the transaction message section with your desired screw size (①～⑥), color (white or black), and the desired dimensions (mm) for D, L, LH2, and LT. (Please do not specify your desired specifications in the question section. It will be indistinguishable from others and will disappear after the winning bid.) We will start production after confirming payment and will ship the product upon completion. Delivery usually takes about 1-2 weeks, so please understand. 《 Delivery method 》 Free shipping, but it will be via regular mail (定形外郵便). 《 For those who want a different shape, dimensions, or material 》 If you want to deviate from these standard sizes or want to use a different material, the price will change, and it will be a different product. Communication regarding different products is prohibited in the comment section or question section, so please contact us directly via the "Wood Workshop Craft Miya" HP inquiry form. First, we will inform you of the feasibility of production and provide an estimate. (Sending your desired dimensional drawings, etc., to the email address listed on the HP cover page will help the process run smoothly.)