These IRWIN Multi-Material Jobber-Length Drill Bits are made with diamond-ground, 4-facet carbide tips with sharp cutting edges to drill through multiple materials at once. Their powerful tips can drill through brick, block, tile, metal, wood, plastic and marble. Each durable drill bit is designed for rotary drilling but is tough enough to be used with hammer drills. The IRWIN drill bits feature double-milled flutes that help remove drilling debris to prevent clogging. From the Manufacturer The Irwin Tools 1792769 Multi Material Drill Bit 3/8-Inch is designed to drill into a variety of materials. These bits will drill in brick, block, tile, metal, wood plastic and marble. The brazed carbide tip has a unique diamond ground 4-face design for excellent centered starts with little walking and best hole quality. The special Grind angle creates sharper tip edges for Fast starts in tough materials and the double ground flute ensures fast and efficient removal of the drilling dust and prevents clogging. The multi-material but features a special duo tone surface finish that reduces friction and resistance, therefore increasing bit life and drill battery life.