It has a 1/4 in. External hex shank for use with drill drivers, screwdrivers and especially impact screwdrivers. The very robust Impact Control screwdriver bit is even suitable for the high torque of impact screwdrivers. The special torsion zone gives the bit an extremely high durability for continuous use, the S2-modified steel and the optimized heat treatment process enable maximum performance under the harshest conditions. This product is perfectly suitable for heavy tasks such as extensive assembly or heavy industrial work.