Valve Core Removal Tools are designed to make work more efficient, but there s nothing efficient about losing tools or equipment. The hilmor Valve Core Removal Tool has a built-in rare-earth magnet on the back of the plunger for convenient jobsite storage. After removing the core for evacuation or change-out, the plunger and valve core can be stored on the side of the unit. The tool comes in both 1/4 and 5/16 sizes.