Irwin Rotary Drill Bits with Slow Spiral Flute is made with tungsten carbide tip for durability in concrete and brick. Rotary slow spiral masonry bit. Bits 7/16 in. and larger have reduced shanks. • Deep single flute removes drilling dust fast • Diamond ground tip with more aggressive cutting angles for increase drilling speed • Specially designed carbide tip for rotary hammer drill applications • Slow spiral for quick, easy debris removal •
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