WIDE RANGE OF USES: solid carbide tip, with spear tip design, can easily drill through various materials, Such as tiles, concrete, bricks, glass, plastic, wood, etc. ANTI-SLIP FUNCTION: The triangular handle can firmly fix the drill bit and prevent slipping. It can be installed in hand drill, electric drill, bench drill EASILY REMOVE CHIPS: U-shaped groove design provides low resistance for faster and smoother,Drill holes and remove chips more easily. HIGH-QUALITY MATERIAL: hard alloy and alloy can prevent the drill bit from cracking, and has The fixed head can prevent the drill bit from cracking and extend its service life. TIP: There are 7 different sizes of drill bits:3mm, 4mm, 5mm, 6mm (1/4inch), 8mm (5/16inch), 10mm (3/8inch), 12mm (1/2inch). When drilling glass, porcelain floor tiles, marble, and other hard materials, please lubricate with water., Manufacturer: Jnchdghwa