The RC hex screwdriver is for parts and accessories of remote control toys, Rc helicopters, airplanes, cars, boats, model building kits. Each wrench has a handle in alloy coded and a replaceable bit, alloy handle for easy storage of nails, screws, nuts, avoiding losing or dropping small items. These hex screwdrivers are made of premium quality. Bits feature titanium nitride coating for extra durability, high speed steel and aluminum alloy material, very durable in use, corrosion resistance and anti-rust. Simple and practical design, comfortable to handle and easy to use. Wrench size is stamped on each handle for easy identification. Hex head screws include: 1 X 4.0mm; 1 x 5.5mm; 1 x 7.0mm; 1 x 8.0mm. Product Information: Brand New Titanium Nitride Hex Driver Bit bits have a titanium nitride coating for increased durability 4.0mm/5.5mm/7.0mm/8.0mm RC Titanium Nitride Socket Nut Wrench Tool Kit 4 pcs. Color: Black Package Included: 1 x 4.0mm Flat Head Hex Driver 1 x 5.5mm Flat Head Hex