Hex 4pcs Screw driver Tools Kit Set for RC Helicopter     1.5MM 2.0MM 2.5MM 3.0MM Hex Screw include     Diameter of handle: 18mm     Total length: 180m     Used for disassamble Hex Screw in helicoptor and other place     Color: Gold Including:     1x 1.5mm Hex Key     1x 2.0mm Hex Key     1x 2.5mm Hex Key     1x 3.0mm Hex Key