Hitachi 725703 SDS Plus 8-3/4-Inch Long Shank for Lightweight Hollow Core Drill Bits with 1:20 Tapered Shank (A-Taper) 8-3/4-inch long shank adapter for lightweight hollow core drill bit; 1:20 tapered shank (A-Taper) Made of high quality carbon-hardened steel For use with rotary hammers Adapter allows for flexible and economical use of the Lightweight Hollow Core Drill Bit system Comes with a 30-day limited warranty High Quality Carbon Hardened Steel High Tolerance milled shank provides perfect fit CNC Controlled manufacturing ensures 100% quality consistency