The irwin speedhammer max drill bits have been designed for easy and trouble free drilling of concrete granite and similar very hard materials the patented carbide tip head takes 80 of the workload ensuring higher durability speed and rebar performance the 53 drilling head design means more aggressive cutting and faster dust removal for overall faster performance and the four cutter tips for less vibrationfaster drilling rounder holes and better anchoring the shank fits all sds max rotary hamme