The bolt is a kind of door hardware that prevents the door from opening. The preferred material is stainless steel 304. Because it needs to be used for a long time and exposed to the air, then you can choose the RDA-20 A type bolt of Lelang Hardware. The bolt Made of 304 stainless steel, it can not only be anti-corrosion and anti-rust, high strength, fireproof, anti-pry and anti-shock, but also has a longer service life than ordinary door latches, without frequent replacement or repair. Seen on the market, cheap bolts are usually made of zinc alloy. Such materials are low in cost, brittle and easy to break, prone to spots, and the internal materials are prone to oxidation. It is much worse than stainless steel 304.