We are offering nut runners.This tool is designed for operation with a pneumatic screw drivers. Nut runners has a male hex drive on one end which fits into the female hex shank of the pneumatic screw driver and on the other end is a single hex socket. The range covers 14" and 516" hex drive for nut sizes ranging from 8mm to 13mm in three lengths i.e. 75mm; 100mm and 150mm.