Mini 4WD Gear Lightweight Hole Drilling Jig for Response Improvement "Counter/Spur Gear" - It's important to drill holes evenly! By drilling holes (6 places) in the counter gear and spur gear, weight can be reduced. Response also improves. Therefore, it is important to drill holes evenly. 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 me, I can combine shipping with other items I have for sale, so feel free to ask. Made by "Shimizu Seisakukobo"