Slug-o-ster knockout punches are a boon for panel manufacturers, electrical con-tractors, and for offshore projects. Slug-o-ster can punch holes within a minute, ranging from 12 mm to 125 mm dia in sheet metal thickness up to 10 gauge [3 mm approx.]. Special punches can be supplied for making holes of square, rectangular, or other shapes as de-sired. These are available in wrench-driven, hand, hydraulic, or electro hydraulic models. Benefits of hydraulic knockout punch driven with hand pump over wrench-driven knockout punches: fast, easy, and simple to operate; it punches holes three time faster than wrench method; takes very less amount of cutting load; life of stud is more found; cutting in the cor-ner of panel or where one cannot rotate the wrench easily, and the use of hand hydraulic is necessary.