As the professional manufacturer, we would like to provide you Stainless Steel A2-70 DIN316 M8 Wing Bolt. A bolt is a form of threaded fastener with an external male thread.Wing screw also called thumb screw, which designed for easy operation and hand tighten design without tools, the head of the wing design increases the transverse force to make the hand twist more efficiently, The wing screw or thumb screws are mainly used in the monitor industry, household appliances, telecommunications and data communications, automotive and other industries which need both insulation and require frequent disassembly to equipment maintenance.