Drop-forged and heat treated components Gripping surfaces of case hardened alloy steel Exclusive feature is a patented wear indicator system When convex teeth are flattened between unique wear indicator grooves It is time to change the cam Note: The Pad and Cam should be replaced at the same time Newly designed "Cam Engaging Lever" keeps the cam in contact with plate The tension arm & spring mechanism facilitate attaching & removing clamp Clamps 100% Proof Tested, a Certificate of Test supplied with each clamp Never tamper with clamp's tension arm & spring mechanism during a lift