Using rare-earth magnets with our counterbored zinc-plated steel cups and washers is an excellent way to make a wide range of fastening systems, such as closures in cabinet doors or box lids. Mounting magnets in cups increases their attraction and provides a convenient way to set them into wood or other materials. Countersunk to accept a mounting screw, our steel washers provide a contact point for the magnet to adhere to on the adjacent surface.