Irwin 323005 Hammer Drill Bits, 5/8" x 8" x 13"The Irwin Tools 323005 Drill Bit, 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