Used for first operation work, standard and custom stepped hard jaws feature gripping surface that accurately contacts most of workpiece length and diameter for maximum drive. Diamond shaped serrations increase holding power, and standard construction is of 8620 steel carbonized and hardened to Rc 52-55. Manufactured to customer specification, custom top jaws center workpiece and grip it equally. Extra wide jaws are available. Multiple radii for are available for inside and outside clamping.