High- multi-function drill kit made of tungsten carbide, will not rust, prevent the drill bit from cracking, has a service life than the average steel drill bit, and is durable. drill bit makes drilling easier, less labor-intensive, and works at pressure. The process design of the spiral drain groove can chip removal, effectively prevent the retention of accumulated and work efficiency. The spear tip is designed with a sturdy hard alloy tip easily penetrates a of materials. The custom triangular tip prevents slipping during punching and is easy to install. Normal impact drills, electric drills and drill can be installed and used. Size for various purposes, to the of your work. The masonry drill bit set easily penetrates a 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:blue Material:alloy Package Contents: 2*3mm Drill 2*4mm Drill 2*5mm Drill 2*6mm Drill 1*7mm Drill 1*8mm Drill 1*10mm Drill 1*12mm Drill Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.