Product Description:The material of multi-material twist drill bit is high-quality cemented carbide, which prevents the drill bit from cracking and improves durability. One drill bit replaces two drill bits (glass and tile drill bit and drill bit). The pointed design with carbide as the material can easily penetrate into various materials. U-slot design increases opening speed, easy chip removal. Wide Application: Pointed Spear Design Strong tungsten carbide tip can easily penetrate into various materials such as tile, concrete, brick, glass, plastic and wood, etc., and reduces crackingSpecification:Material: hard alloy Tool holder type: triangle handleCooling type: external coldTop corner of blade: 135°Category: hole expansion drill bitOptional style: 3mm,4mm,5mm,6mm, 8mm, 10mm, 12mm Weight: Approx. 20-69g Blade Diameter: 6-12mm Size: 4mm:4mm*80mm/5mm5mm*80mm/6mm:6mm*100mm/8mm:8mm*100mm/10mm:10mm*118mm/12mm:12mm*120mmPackage including:5PC Plastic Box (4 5 6 8 1 0)7PC Plastic Box (3 4 5 6 8 10 12)