The IRWIN Speedhammer Quad Drill Bit is ideal for drilling plug and anchor holes in masonry, all types of stone and concrete. Its 4-cutter geometry, drills a more concentric hole for the best fixing retention. The full head carbide tip offers the highest levels of drilling life and durability. A unique bonding system connects the solid carbide head to the 4-flute spiral. This design provides faster, more efficient dust removal. The specially engineered grooves are designed to minimise friction, resulting in increased speed and longer life. Manufactured in Germany with premium steel. Meets PGM standards for drill bits used for anchor fixing. This IRWIN Speedhammer Quad Drill Bit has the following specification: Diameter: 12mmOverall Length: 260mmWorking Length: 200mm