EFFICIENT: SDS-max carbide-tipped rotary hammer core bit features an effective wave design to transfer energy for up to 40 percent speedier drilling versus other bit designs. POWER: With an integral shank, the HC8555 offers better power transmission and is designed to allow smaller hammers to drill larger holes. VERSATILE: This core bit is versatile in application with materials including concrete, brick, and block. SDS plus shank, male thread Adapter,Greatly replace the broken adapter with your drill chuck High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth