Cool Blocks Band Saw Blade Guides replace standard metal or plastic guides and enhance cutting performance! | Cool Blocks blade guides allow blades to run cooler and last longer with less friction. | For Shopsmith Band Saws. Contains: 2 guide blocks 3/8″ x 3/8″ x 7/8″ and 2 guide blocks 3/8″ x 1/4″ x 1-5/8″ | Includes: 4 band saw blade blocks Please note the actual dimensions of the Cool Block can be smaller than its nominal dimension by up to 0.05″. For example a 1/2″ Cool Block may measure 0.45″. This is to allow for expansion due to humidity.