Quality material: The 1/4 inch (F) to 1/2 inch (M) socket adapter is very hard and durable as it is made of high quality chromium-vanadium alloy steel and heat-treated chrome-plated surface to prevent rust. Wide application: Socket adapters and retarders are widely used in DIY crafts, car repair, home repair and most general repairs. Performance: Suitable for all cordless, electric and pneumatic impact wrenches, extending access to fasteners at tight points. Size: 1/4 inch (F) to 1/2 inch (M) socket adapter. Safe and sturdy: 1/4 inch (F) to 1/2 inch (M) drive the sleeve with spring-loaded ball clamps and grooves at each end, keeping the sleeve secure and preventing it from falling out., Manufacturer: Rumyve