High-quality multi-function drill kit made of tungsten carbide, will not rust, prevent the drill bit from cracking, has a longer service life than the average steel drill bit, and is durable. Excellent drill bit makes drilling easier, less labor-intensive, and works at minimal pressure.The process design of the spiral drain groove can speed up chip removal, effectively prevent the retention of accumulated chips and improve work efficiency. The spear tip is designed with a sturdy hard alloy tip that easily penetrates a variety of materials. The custom triangular tip prevents slipping during punching and is easy to install. Normal impact drills, electric drills and drill bits can be installed and used.Assorted Size for various purposes, to meet the daily needs of your work.The masonry drill bit set easily penetrates a variety of materials such as tiles, glass, hard plastics, cement concrete, brick walls, wood, and reduces cracking. Materials with higher hardness are better for use with water.colour:blueMaterial:alloyPackage Contents:2*3mm Drill Bits2*4mm Drill Bits2*5mm Drill Bits2*6mm Drill Bits1*7mm Drill Bits1*8mm Drill Bits1*10mm Drill Bits1*12mm Drill BitsOnly the above package content, other products are not included.Note: Light 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.