The Rawl Zinc plated 5-Piece sleeve bolt is a construction grade fastener that is commonly used as a climbing anchor. Expansion is created by tightening a threaded bolt which draws a tapered cone expanding a sleeve against the walls of the hole. The Rawl 5-Piece bolt works well in soft rock where maximum expansion is required. Plated Steel Specs: 1/2" Bolts TORQUE TO: 40 Foot Pounds 3/8" Bolts TORQUE TO: 20 Foot Pounds