RC Hex Screwdriver is for Remote Control Toys Parts & Accessories, Rc helicopters, airplanes, cars, boats , Model Building Kits. Each wrench features a coded alloy handle and a replaceable bit, alloy handle easily storage nails, screws, nuts, prevent losing or dropping small items These Hexagon Screwdrivers are made of high quality, The bits have a titanium nitride coating for additional durability, High-Speed Steel and Aluminum Alloy material, very durable in use, corrosion resistance and anti-rust. Simple and practical design, comfortable to grip and easy to use. The wrench size is engraved on each handle for easy identification. Hex Screw include: 1 X 4.0mm; 1 X 5.5mm; 1 X 7.0 mm; 1 X 8.0 mm.