HIGH HARDNESS MATERIAL: Using carbon steel + YG8C alloy, our drill bit kit is made of upgraded thickened hardened and durable alloy, with anti-rust treatment, long service life, its hardness is superior to that of an ordinary drill. Chisels and drills are also combined, and the pointed tip design is more convenient to use, saves time and enables quick drilling. WIDELY USED: Only suitable for ceramic tile openings , concrete, red bricks, marble, wood, glass, plastics, etc. down. PACKAGE INCLUDES: A total of 12 pieces, 3mm, 4mm, 5mm, 3*6mm 2*8mm; 2*10mm, 2*12mm; widely used in home decoration, manual DIY and other scenes. UNIQUE DESIGN: Using exquisite craftsmanship, sharp cutting edge, hardening and anti-fracture, quenching high temperature, fast drilling, fast removal of wire chips, as well as wear-resistant hard alloy triangular drill bit, the drill bit is carefully polished, and the texture is consistent. TILE DRILL BIT: This drill bit can be used for many kinds of machines such as ordinary hand drills, bench drills and rechargeable drills. The clamping range is available within 10mm. After each use, please wipe the stains on the surface of the product and apply rust-proof oil to prevent it from rusting.