The J Bolt sieve hook is generally used in the activities of anchoring walls to concrete foundations, tensioning screen wires and in the roofing industry, stainless steel that hooks around rebar for twisting or support and can be cast into concrete for use as anchor bolts, to fix design roof sheets and metal, concrete or wooden objects. It is a threaded fastener made of heavy metals such as St.Steel or zinc-plated steel and titanium.