Bosch SDS-Plus rotary hammer core bits are designed for core drilling with smaller sized hammer drills using SDS shanks. The cutting teeth are carbide, coring concrete holes from 13/8 to 31/2 in. The core body length is 41/8 in., allowing for a useable cutting depth of 3 in. A centering pin included in the assembly allows the operator to accurately locate holes. Bosch Power Tool Corp. 877-267-2499.