The BU-CRIMPER is an alligator clip tool used for fastening Mueller alligator clips to wire. Our crimping tool for sale is compatible for use with the following small alligator clips:BU-30BLBU-60BU-60SBU-60CBU-60CSBU-60MBU-60XBU-P2240-0BU-P2240-2BU-P6567