Material: Hard Alloy SIZES: 6mm\/8mm\/10mm\/12mm Tool Holder Type: Triangle Handle UNIQUE DESIGN: U type slot design with fast drilling dust remove, antiskid triangle handle allows the drill bit to be held tightly and stable in power drill. WIDE USAGE: Spear pointed design strong tungsten carbide tip can easily penetrate various material like tile, concrete, brick, glass, plastic, and wood, etc, and reduces breakout. Can be used in the hand electric drill, table drill, etc. Note: 1.When drilling hard material such as glass, porcelain floor tile, marble, granite, etc, please use water for lubrication. 2.Allow 1-2cm error due to manual measurement 3.The color of the items in the photos displayed on the computer monitor may be slightly different because the display is not calibrated the same