1.5mm, 2.0mm, 2.5mm, and 3.0mm rc hex driver bits, suitable for most 1/4in electric screwdriver, hand screwdriver, electric drills, and air drills. RC drill bits are made of solid S2 steel and titanium coating, with high torsion and hardness, resistant to stripping and breaking, rust-proof and durable. Widely used for RC hobby models, automobiles, and other household tool repairs