Tigrip® Load Hoisting Tackle Grabs & Clamps Yale Capacity 250 and 500 kg The TVB block grab is useful for the transport of stone and concrete blocks and other materials with parallel surfaces. The grab has a protective lining to ensure a safe and non-marring transport. The clamping jaw and the center of gravity are easily and quickly adjustable by means of the locking pin. It is important that the surfaces are dry, clean and free of oil and grease.