SHPR18S | Stronghand Locking C-Clamp (OAL 450mm Swivel Pad) Locking C-Clamps Improved features for professionals and Do-It-Yourselfers. Made of heat treated steel and nickel/chrome plated for strength and durability. Updated features help you work quickly safely and efficiently. OAL: 450mm Throat Depth: 254mm Opening: 114mm Weight: 1.4kg