These cylindrical supports provide high load capacities and fasten with a mounting screw through the bottom for low profile. Ideal for preventing the workpiece from chattering and deflecting. The positive locking mechanism allows the ball-thumb screw to offer high support capacities. Compatible with the BJ650 remote control unit is available for remote operation at a distance (sold separately). Body is made from 1045 steel with a black oxide finish. The piston is made from SK95 steel, quenched and tempered, with a black oxide finish.