100% Brand New.Material: Tungsten steel Solid CarbideShaft diameter:Approx.3mmBiggest Drill Bit size: Approx.6mmQuantity: 10 PcsCompatibility: Smaller rotary tools10 PCS Tungsten steel Solid Carbide Burrs for DIY enthusiast or hobby and craft fan， and give your rotary tool even more functionality with this set of diamond burrs.10 x Tungsten Carbide Grinding Head