【Diamond Coating】High quality diamond coating increases drilling speed and makes the drill bit sharper.【Chip Flute Design】Cut the edge to make it sharper and work more efficiently. The side holes facilitate waste removal while dissipating heat when cutting the material.【Rustproof and Durable】The surface is nickel-plated for longer life and greater resistance to surface corrosion. Universal round handle for electric drills and impact drills.【Application】Center drilling makes drilling easier. Suitable for drilling glass, marble, ceramic tiles, limestone, fiberglass tiles, etc.【Note】During the drilling process, water must be used to keep the drill bit cool to extend the life of the drilling tool. Dry drilling is strictly prohibited.