SDS Max Adaptor Diamond Core Drilling 1.1/4"" UNC. This SDS MAX adaptor will allow you to use the diamond wet core bits with any hammer with SDS MAX fitting. Made from high quality carbon steel, tempered and hardened. Please be sure to switch your tool to drilling mode (without impact). Use your SDS MAX hammer drill as a diamond core drilling machine. Will take ONLY 1.1/4" UNC threaded core bits.