Hook Type Fastener offered is heavy duty fastener with external screw threads made of rust proof passivated steel. This is ideal for push through anchoring of all types of machinery and equipment. This is specially designed to hang ceiling fans, jhoomer, baby swings, ropes, etc. This is made with rust proof low carbon alloy for taking heavy load with machine screw threads. Hook Type Fastener is made of rust-proof passivated steel and white zinc plated to provide additional corrosion protection.