Heavy duty steel nails are made of aluminum alloy + steel, resistant to stripping and damage Package contains 1 x 4.0mm hex driver, 1 x 5.5 hex driver mm, 1 x 7.0mm Hex Driver, 1 x 8.0mm Hex Driver Hobby-Ace has more FPV collections on Amazon, look up to the sky and run like a free bird for an experience Ultimate First Person Viewer The hex nut screwdriver is used to disassemble rc helicopter, airplane, car, boat, especially 450/ESKY CP V2 King 3 helicopter Style Name: 4pcs C 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: The driver head is made of high speed steel with titanium plating, which is more durable. Aluminum alloy + steel screwdriver handle, exquisite design Description: Product name: Hex nut screwdriver Material: aluminum alloy + Steel Color: Black + Silver Package Weight: 201g/7.1oz Package Include 1*4.0mm Hex Nut Driver 1 5.5mm Hex Nut Driver< /p> 1 * 1 * 7.0mm Hex Socket Driver 1 * 8.0mm Hex Driver Note: The data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received Delivery Quantity: (according to the main picture)