Olson Saw CB50080BL 9-Inch Benchtop Band Saw Accessory Cool Blocks Round guides for 8" Delta 28-180 & 28-185 and 10" 3-wheel Bench top Saws Contains: 4 guide blocks 3/16" dia. x 3/4" Cool Blocks blade guides are made from a high tech, non-metallic composite material, "Graphite Impregnated Phenolic Laminate"