Bi-metal sharp hole sawkit, for cutting through materials like plaster, wood, and mild steel quicklyand easily. Kit includes 12” extension arbor, 1/4” arbors, 7/16” arbors, SDS plusshank, extension bar, and 4mm hex key. Also includes 7/8”, 1-1/8”,1-3/8”, 1-/12”, 1-3/4”, 2”, 2-1/2”, 3”, 3-5/8”, 4-1/8”, and 4-1/2" holesaws. Come neatly organized in sturdy blow molded case.