Mini 4WD Lightweight Gear Processing Jig for Response Improvement "Counter Gear, Spur Gear" Jig strength has been increased. [Shimizu Seisakushuri Kobo] By drilling (6 places) on the counter gear and spur gear, weight reduction is possible. Response also improves. By using this jig, holes can be drilled evenly. Please use a 2mm drill for drilling. This is an auction for the processing jig tool only. Please prepare a 2mm drill, fixing screws, and shaft. How to use it is very easy, please purchase only if you understand. This product is manufactured using a 3D printer. There is no problem with its use, but the color may differ from the image or the shape may be slightly different. Please understand. If you contact us, we can combine shipping with other items we have for sale, so feel free to do so. Made by [Shimizu Seisakushuri Kobo]