The Rad grip is designed from precision ground and vacuum hardened A2 tool steel. Rad grips can be used in fixtures or bolt on jaws for holding round or square parts. In fixture applications the height of the pocket can be varied to allow you to hold onto more or less material. When used in bolt on jaws shims are included to allow for holding onto as little .060 and up to .080. These grips can be used on hardened, flame cut, castings and everything in-between. They come in sets of 4 with hardware and shims included.