This blade set will fit most of the following brands of power trowel machines; Allen Razorback, Bartell, Champion, Corbit Northrop, Husqvarna, MBW, Morrison, Stone, Stow, Wacker, Whiteman/MultiQuip. Made from specially formulated hardened and tempered spring steel. The high carbon content provides abrasion resistance for longer wear. Bon is the preferred brand of professional contractors.