Sturdy steel tips Made of aluminum alloy + steel material, resistant to stripping 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; Cutter Head Length: 8.5cm / 3.3inch Hex Nut Drivers used to disassemble RC helicopters, airplanes, cars, boats, especially 450 helicopters Style: 4 pieces C Hobby-Ace 4pcs & nbsp; 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 Functionality: The pilot's head Using high speed steel with titanium plating will be more durable. Aluminum alloy + steel screwdriver handle with a delicate design Description: Item Name: Hex Nut Driver Material: Aluminum Alloy + Steel Color: black + silver Length of the cutting head: 8.5 cm / 3.3 inches and nbsp / Handle length: 9 cm / 3.5 inches and nbsp / Total length: 17.5 cm / 6.9 inches and nbsp / Package size: 21 x 9.3 x 2cm / 8.3 x 3.7 x 0.8in and nbsp / Package weight: 201 g / 7.1 oz and nbsp / Packaging including 1 * 4.0mm Hex Wrench Socket Screwdriver 1 * 5.5mm Hex Wrench Socket Screwdriver 1 * 1 * 7.0mm Hex Wrench Socket Screwdriver 1 * 8.0 mm Hexagon socket screwdriver