H345 Hacksaw Blades Bi-Metal Carded Sutton Tools All Hard HSS Hacksaw Blades are suitable for highly accurate cutting & high wear resistance. 18 TPI: For 6-25mm materials eg pipe, angle iron & steel bar. 24 TPI: For 3-6mm materials eg conduit, heavy sheet metal & tubing. 32 TPI: For <3mm materials eg thin sheet metal & metal trim. All Sutton Tools hacksaw blades have 300mm hole centres to fit all standard size hacksaw frames. Colour coded and clear markings for easy identification 300mm pin hole centres fit all standard hacksaw frames All Hard HSS blade material for highly accurate cutting & high wear resistance