4-piece screwdriver set, multi-functional maintenance tool, including 4.0/5.5/7.0/8.0mm hex screwdriver, suitable for RC cars and RC helicopters. Heavy duty construction with aluminum alloy and steel materials, resistant to stripping and damage. Package contains: 1 x 4.0mm hex driver, 1 x 5.5mm hex driver, 1 x 7.0mm hex driver, 1 x 8.0mm hex driver. The hex nut screwdriver is used to disassemble RC helicopter, airplane, car, boat, especially compatible with 450/ESKY CP V2 King 3 helicopter. Style Name: 4pcs Screw Hex Nut Driver Tool Kit for RC Helicopter RC Boat RC Car, Metal 4.0/5.5/7.0/8.0mm Nut Wrench Socket Driver. Features: Driver head made of high-speed steel with titanium plating for enhanced durability. Handle made of aluminum alloy and steel with refined design. Product name: Hex nut screwdriver. Material: Aluminum alloy + Steel. Color: Black + Silver. Package weight: 201g / 7.1oz. Package includes: 1 x 4.0mm Hex Nut Driver, 1 x 5.5mm Hex Nut Driver, 1 x 7.0mm Hex Socket Driver, 1 x 8.0mm Hex Driver. Note: Measurements are manually taken, please allow 1-3cm error. Due to lighting and display differences, slight color variation may occur. Actual product may vary slightly in appearance. Delivery quantity based on product image.