The ZIPBOLT UT - RAILBOLT uses the same boring configuration for bolts commonly used in the industry, with a very big difference. The use of a one-piece totally integrated gear system that replaces the old nut and washer. Assembly that simplifies joining parts together using common bits and drivers. Using a 5mm hex head driver, the installer no longer is trying to fit a nut and wrench into a 1" hole. The hex is inserted into any adjustable torque drill, and makes tightening the gear head easy.