The Irwin masonry drills bits are designed for fast and efficient drilling in brickwork, concrete and breeze block, especially with cordless drills. The single flute design ensures faster dust removal for increased drilling speed, with the unique, pressed carbide tip allows for aggressive cutting and carbide tip design ensures 20% longer life vs. previous Irwin ® Masonry Drill Bits. Made with a Chrome Vanadium Body with high carbon content which allows more hardening and a stronger bit for maximum rupture strength.