Diablo DMAST1030 SDS-Plus 2-Cutter Carbide-Tipped Hammer Stop BitDiablo's SDS plus 2 cutter carbide tipped hammer stop bits provide one of the fastest and longest lasting drilling solutions on the market for concrete. Highlights: Size : 1 2 inch x 1 11 16 inch Featuring a stop collar, these bits have a pre determined stopping point for efficient shallow anchor installations Optimized with a unique brazing and hardening process, the carbide tips extend life and productivity, allowing users to drill fast, accurate