Irwin Industrial Tools Makes MARATHON circular saw Blades for a full range of saws and applications. In Residential Construction, there is no room for error. Tools must be of the highest Quality, with precision and performance you can always depend on. thats why professional choose the MARATHON family of circular saw blades from Irwin Industrial tools. Offering a wide verity of blades for every construction application, Irwin meets your exacting standards as it continues to lead the industry. Marathon. A Time tested brand. a Family of superior Saw Blades and professional results.