KKmoon 6pcs/set Carbide Alloy Titanium Plated Triangle Glass Drill Tungsten Steel Tile Drill Titanium plating, which is well protected against rust. Applicable to ordinary hand electric drill or bench drill. Suitable for drilling in ceramics, glass, granite, ceramic tile and brick wall, etc. It has 6 sizes(4mm, 5mm, 6mm, 8mm, 10mm, 12mm) in one set, which meet your different needs perfectly.