<b>SPECIFICATION:</b><br/> -- Material: Premium Cemented Carbide<br/> -- Type of Bits: The materials cemented carbide of the drill bits is premium<br/> -- Shank: 3-flats shank<br/> -- Color: Silver<br/><br/> <b>PACKAGE (5 PIECE):</b><br/> -- 2 x 6 mm (1/4")<br/> -- 1 x 8 mm (5/16")<br/> -- 1 x 10 mm (3/8")<br/> -- 1 x 12 mm (1/2")<br/> -- 1 x plastic box<br/><br/> <b>UPGRADED:</b><br/> This Eaninnno Drill Bits Set made of the cemented carbide. This concrete drill bits openings are neat, smooth, surface rust <br/> treatment, and free of smashed edges will not cause tremors, easy chip removal.<br/><br/> <b>USED FOR:</b><br/> Spear pointed design strong tungsten carbide tip can easily penetrate various material (concrete, ceramic tile, brick, wood, plastic, soft metal, wall, stone, etc).<br/><br/> <b>*WARM REMINDING*:</b><br/> Eaninno power drill bit set, do not use impact mode of drill or hammers. When drilling, please use <b>WATER</b> for <b>COOLING</b>. <br/>After the drill bit is used, please dry the water or apply the oil to prevent rusting.