High-quality material Made of high-quality hard alloy. The technology of the cutter head strengthens the hardness of the drill bit. The surface is fully ground and anti-rust, clean and sharp without burrs. Drills are more wear-resistant and more durable. Unique horizontal angle design Small incision resistance, stable drilling, fast speed, no edge damage. The opening is neat and , without broken edges, no tremor phenomenon, and not easy to collapse. Widely Used Professional glass and tile drill bit for and accurate drilling on tiles, marble, thin iron plates, mirrors and glass. Remember to add water or coolant while drilling. 5 different sizes 5MM 6MM 8MM 10MM 12MM are suitable for your different needs. It can be installed on general hand electric drills and bench drills. Colour:black Material:hard alloy Size:4.5 x 2.2 x 14.1cm Package Contents: 10 x Multifunctional tile drill bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.