Vktech 4 in 1 Tool Set Hex Screwdriver For RC Helicopter Car Repair Kit Steel 100% Brand new and high quality Made from high quality alloy steel. 4 kinds of tip size for different needs: 1.5mm, 2.0mm, 2.5mm, 3.0mm. Easy to change the tip for use. Suitable for different kinds of RC helicopters, airplanes, cars, boats, etc.