Thank you for viewing. This is a processing jig made by Potential Racing for Mini 4WD. It includes a Hexagon Piercer set and a separate set of 4 replacement shafts. This is a jig for processing the wheel mounting holes of Mini 4WD. I used it a few times after purchasing it, but I stopped playing Mini 4WD, so I stored it as is. It's a discontinued item, so it's difficult to obtain. Only one set in stock, available for immediate purchase.