Olson Saw CB50050BL 14-Inch Band Saw Accessory Cool Blocks For most 14" Band Saws including Sears Craftsman 14", Jet, Grizzly, Ridged The metal to metal contact made by old metal guide blocks creates heat and friction which cause premature blade wear and breakage Cool Blocks blade guides are made from a high tech, non-metallic composite material, "Graphite Impregnated Phenolic Laminate"