Product Name: Winged Butterfly Screw Material: Durable 304 stainless steel. Compared with normal stainless steel, it is safer, more durable, non-toxic and corrosion resistant. It is of high hardness and not easy to deform. It can be used in humid outdoor environment. Feature: Special wing design, increase the side bearing area and make it easier to fix, can be used as a repeated. Usage: Turn the screw by hand without any other tools, easy to install. Applications: Widely used in machinery and equipment, electronic equipment, equipment communication, hardware store lighting, bridge construction, furniture decoration which requires frequent insulation, dismantling and maintenance.