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 feature allows the plunger to remain in the retracted position. The body is made from steel with a black oxide finish. The plunger pin is ground and hardened. Supplied with jam nut. The knob is made from black plastic.