Product name: Wing Butterfly Screw Material:Durable 304 stainless steel.Compared with normal stainless steel,it's safer, more durable,non-toxic and corrosion resistant.It is of high hardness and not easy to deform.It can be used in outdoor humid environment. Feature: Special wing design, increase the lateral bearing surface and makes it eaiser to fasten, can be used repeatedly. Usage: Twist the screw by hand without any other tools, easy to install. Applications:Widely used in machinery and equipment, electronic equipment, communications equipment, hardware lighting, building bridges, furniture decoration which require insulation, frequent dis-assembly and maintenance., Manufacturer: BOZONLI