A-Able Ace Breaker Tool Kit - Tool #1 removes the hard center post or "head" in about 10 seconds without drilling. Tool #2 guides the drill through the center core. When you are about 1/2" deep, the core will come loose from the housing and rotate freely. On cam and screw type cylinders, the job is complete at this point. Some cylinders require the use of both tools. Some cylinders will open easily, using only the breaker tool in the keyway. Apply turning pressure in the opening direction and the cylinder will turn in the housing.