Adjustable jaws with locking feature to suit both hexagon & octagon wheel bearing lock nuts. Includes three sets round & three sets square of pins to suit lock nuts with pin holes Suitable for 6Pt lock nut 1-3/4" to 5-1/4" (49-135mm) across the flats and 8PT lock nut 1-3/4" to 5-5/8" (49-143mm) across the flats. 3set round pin:1/4" (6mm), 5/16" (8mm), 3/8" (10mm) 3set square pin:1/4" (6mm), 5/16" (8mm) , 3/8" (10mm)