1. Special sharpening technology, low cutting resistance, high hardness, and sharper opening 2. Efficient spiral chip removal is smooth and flat without sticking to the knife, and drilling is smoother 3. It can be used for glass, ceramic tile, cement wall, plastic iron sheet, glass, wood, etc. The openings are non-destructive to the tile wall 4. Triangular shank design, clamping is more tight and not slipping 5. When the drill is used, the effect of adding water is better, and colleagues can extend the service life Material: Carbide Maximum depth of cut: 70mm Blade size: 6-12mm Category: Reaming drill Blade diameter: 6-12 (mm) Blade length: 100-120 (mm) Full length: 120 (mm) Shank diameter: 10 (mm) Size: 6mm(1pcs) , 8mm(1pcs),10mm(1pcs),12mm(1pcs),6 6 8 10 12mm (5pcs/set)