Features: brand new and high quality Material: Hard alloy steel cutter for head, four-blade design, low cutting resistance (higher hardness than ordinary drills). The hexagonal handle is non-slip, not easy to slip, and the electric drill is more stable. It can be used to punch holes in glass, ceramic tiles, plastics, wood, concrete and other materials. It is suitable for electric drills, for bench drills and other general drills, but not for percussion drills. Tip: Lithium batteries below 18V are not recommended, because they are too weak and cannot be used. When drilling holes in the wall, you must change the position of the steel bar, and the steel bar will cause the cutting edge to crack. Specifications: Material:Cemented Carbide Diameter 1:Approx.10mm/0.39inch Diameter 2:Approx.12mm/0.47inch Diameter 3:Approx.4mm/0.15inch Diameter 4:Approx.6mm/0.23inch Diameter 5:Approx.8mm/0.31inch Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xGlass Drill