Features:* .* High hardness and : Made of high-quality alloy material, with high hardness and wear resistance, can be used for a long time.* Useful: spiral shaft increases material removal to leave cleanly drilled holes, also brings fast drilling dust to remove, and 3-flat shank allows the drill bits to be easily connected and, which will be held strong.* Multiple sizes: 7 pieces in 7 different sizes to meet different hole depths and widths. Suitable for most bench drill, electric drill, and drill with drilling function.* Widely used: suitable for brick, block, stone, light concrete, ceramics, hardwood board, glass, marble materials, etc. Specifications:Materials: Cemented CarbideColor: BlackShape: Triangular HandleSize: 3/4/5/6/8/10/12mmNote:When drilling hard material (glass, porcelain floor tiles, marble or granite), please use water to lubricate. Package Content:7 * Drill Bits