High quality - Vastar high-quality non-slip handle screwdriver tool kit set is the best choice for Enthusiast of advanced RC model. Widely used - Hex screwdriver tools kit set widely used for disassembly of rc helicopter, rc quadcopter, rc car , rc boat, drone, etc. Specific functions - Total Length:170mm/6.6inch,Handle Diameter: 16mm/0.6inch Complete kits - Each screwdriver bits is marked with a clear size for easy identification and use,comfortable to grip and not trouble for use. After-sales service - If you have any questions, please don’t hesitate to contact us , we will reply you within 24 hours.