4PCS RC Repair Tools Flat Head Screw Drivers 4.0 5.5 7.0 8.0mm for RC Models Car Boat Airplane Used for disassamble Hex Screw in helicoptor and other place 4.0 5.5 7.0 8.0mm Hex 4pcs Diameter of handle: 18mm Total length: 195mm Length of handle: 90mm