Description:    Metal 4.0\/5.5\/7.0\/8.0mm Hex NUT Key Socket Screw Driver Wrench   Used for helicopters、 airplanes、 cars、 boats、 particularly 450 Helicopters\/ESKY CP V2 King 3.    Specifications:    Material: Aluminum alloy + Steel  Color: Black + silver Length of cutting head: 8.5cm \/ 3.3in  Length of handle: 9cm \/ 3.5in  Total length: 17.5cm \/ 6.9in  Package size: 21 x 9.3 x 2cm \/ 8.3 x 3.7 x 0.8in  Package weight: 201g \/ 7.1oz    Package includes:    1 x 4.0mm Hex key Socket Screw Driver Wrench  1 x 5.5mm Hex key Socket Screw Driver Wrench  1 x 7.0mm Hex key Socket Screw Driver Wrench  1 x 8.0mm Hex key Socket Screw Driver Wrench  Details pictures: