Features:* High-quality Materials: Made of premium YG6X carbide alloy with anti-corrosion treatment and reinforced head prevents bits from breaking and ensures longer service life.* Accurate and Precise: Precision unique cross angle design ground spear tip reduces bit skating and walking; Excellent machine for cutting tiles run by ceramic tile like butter, very neat and fast.* Hex Handle for Quick: 1/4" hex chuck fits all power tools more easily and safely; Compatible with Milw and other general electric hand drill, bench drill with lock in quick handle.* Wide application: suitable for glass, ceramic, tile, mirror, plant planter, wood, porcelain, brick wall, marble, thin iron, etc. Try to keep the drill upright and keep the bits in cooling with cooling water; Do not use on hard tiles. Specifications:Material: carbide drill bitShank type: HexColor: blackDrill diameter: 5mm,6mm,8mm,10mm,12mmPackage content:2 pcs. 5mm drill bits4 pcs. Drill bits 6mm2 pcs. 8mm drill bits1 pc. 10mm drill bits1 pc. 12mm drill bits