These spring loaded hand retractable plungers are used to prevent any change in locking position due to lateral force. Pulling up on the handle retracts the plunger pin into the body. The locking style allows the plunger to remain in the retracted position. The body is made from stainless steel with natural finish. The plunger pin is ground but not hardened. The Novo-Grip knob is made from black plastic.