2 x Bison metal Thread Lock. 10ml Tube. Bison Metal Lock is a liquid locking and sealing agent suitable for use on metal bolts, nuts and screws. Locks bolts, nuts, screws and tap bolts which should be able to be unscrewed at a later date. Stops bolts, screws and nuts from vibrating loose. Seals screw threads and protects them from leaks, rust and corrosion. Shock and vibration proof. Ideal for use with carburettor screws, alternator housings, threaded pipe joints, seals and oil pressure switches. Not suitable for applications with synthetics and wood.