Rotary Masonry Drill Bit with Straight Shank - Rotary drilling - Positive angle tip geometry - Premium brazing material adheres carbide tip to the drill bit body for maximum durability - Slow spiral flute design ensures efficient material removal allowing the bit to run cooler and extending service life - Long sizes are 13 in (330.2 mm) versus 12 in (304.8 mm), allowing bit to fully clear a cinder block - Not recommended for drilling into glass and ceramics