Strong steel body with axial through hole. Three eccentrically placed rollers grip the stud firmly without causing damage. The unit is placed on the stud and is turned. It automatically clamps and holds the stud. Steel body size 6 to 12 with 1/2 inch square socket drive. Size 16 only with spanner flats.
For screwing and unscrewing studs. For right-hand and left-hand threads.
Chrome vanadium steel, chrome-plated surface.