Heavy duty steel spikes Made of aluminum alloy + steel material, resistant to pickling breakage Package includes 1 x 4.0mm Hex Driver, 1 x 5.5mm Hex Driver, 1 x 7.0mm Hex Driver, 1 x 8.0mm Hex Driver Nut Driver Set Length Handle Length: 9cm/3.5inch; Total Length: 17.5cm/6.9inch; Trimmer head length: 8.5cm / 3.3inch Hexagon nut drivers used to disassemble RC helicopters, planes, cars, boats, especially 450 helicopters Style Name:4 Piece C Hobby-Ace 4pcs Screw Hex Nut Drivers Driver Tools Kit Set for RC Helicopter RC Boat Rc Cars, Metal 4.0 /5.5 /7.0 /8.0mm NUT Key Socket Screwdrivers Feature: The driver’s head Using high-speed steel with titanium plating will be more durable. Aluminum Alloy + Steel Screwdriver Handle with delicate design Description: Item name: hex nut screwdriver Material: aluminum alloy + steel Color: black + silver Cutting head length: 8.5cm /3.3inch / Handle length: 9 cm /3.5 inches / Total length: 17.5cm /6.9in / Package size: 21 x 9.3 x 2cm /8.3 x 3.7 x 0.8in /