A set of 2 steel wire wheel with ¼” hex shank that will fit onto any hand drill, drill press with a 3/8” capacity or ¼” drive battery operated rotary tool. They will make fast work of debris removal. Small wheel has a 1-1/2” diameter with a total length of 1-13/32” and the larger wheel has a diameter of 2” with a total length of approximately 1-5/16”. Both wheels have a wire mesh thickness of ¼”. Maximum revolution should not exceed 4500 rpms.