The IRWIN 323015- Drill Bit, 7/8 x 17 x 21 SDS-max 4 Cutter Masonry Drill Bit is a fast and durable bit for the professional user. The bit features a Chrome Vanadium Spring Steel shaft that is through-hardened for Superior Durability. The Shot-peened, double tempered finish reduces breakage. The Bit also features a tip with a Copper brazed material that gives high heat resistance and reduced tip loss. The SDS-max® shank fits all SDS-max® rotary hammers. The four cutter Tip provides more durability and rounder holes.
