Parallel Clamp 2-1/2” Machinist Jaw Length 2-1/2” Jaw Depth 1” Jaw Open 1-3/4”,Depth 1” Jaw Open 1-3/4” Parallel Clamp 2-1/2” Machinist Jaw Length 2-1/2” Jaw,Jaws and screws are hardened steel, Jaw Depth 1” Jaw Open 1-3/4” Parallel Clamp 2-1/2” Machinist Jaw Length 2-1/2”.