9 Pieces Tungsten Carbide Single Cut Rotary Burr SET 1/4" Shank Fit 6mm Shank Material: Tungsten Carbide Use: Rotary Burr Shank diameter:6mm, Shank Length: 35mm/Total length: 45-50 mm 9 pieces Tungsten Carbide Single Cut Rotary Burr SET 1/4" shank Fit Dremel Each package has a separate grinding