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 vibration,faster drilling, rounder holes and better anchoring. The shank fits all SDS-max rotary hammers.The Irwin IRW10502111 Speedhammer Max Drill Bit has the following dimensions:Diameter: 25.0mm.Total length: 320mm.Working length: 200mm.Number of cutting edges: 4.