The irwin speedhammer plus drill bits are designed for exceptional fast drilling in brick block masonry concrete and granite the patented unique single flute design ensures efficient speedy removal of dust and lower vibrations and 28 greater capacity meaning more efficient waste removal they have a patented extra short drill bit head which means the head takes 80 of the workload ensuring higher durability and speed clears drilling dust directly into the flute reducing the risk of clogging the bi