This heavy duty work support is ideal for preventing the workpiece from chattering and deflecting. When a workpiece is loaded on the support, the piston lowers. Turning the hex head locks the piston into position. The hex head locking shaft can be locked and unlocked manually or operated with an impact wrench. The hex head makes it ideal for use with a nut runner on automated production lines. The high support capacity of this work support allows heavy duty machining. The body is made from 1050 steel with a black oxide finish. The hex head and locking shaft are made from 4135 steel, quenched and tempered, with a black oxide finish.