Renfroe NMBL Locking Type Non-Marring Lifting ClampsCapable of gripping stainless steel, copper, aluminum, and other polished metal plates, Renfroe's NMBL Non Marring Lifting Clamps have been manufactured to turn plates from horizontal through a 180 degree arc. Engineered wit smooth gripping surfaces to prevent any unnecessary damage when gripping your plates, the NMBL model incorporates the brands signature 'LockOpen LockClosed' feature that facilitates easy attachment and removal of clamp from plate.