EFFICIENT: The Bosch 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. DIMENSIONS: The Bosch HC8555 SDS-max core cutter measures 4-inches in diameter. The useable length is 17-inches and the overall length is 22-inches. Only for use with SDS-max rotary hammers