These precision guides will upgrade many older saws as well as a host of new imports! Features double row ball bearings that are mounted on a cam to precisely run tight to the blade. Can be used for narrow or wider blades and provides superior support for smoother, more accurate cuts. We do offer a return privelege on these if they will not mount to your saw. Feel free to call us with any questions. Please note, these are the units required for some older 14 and 16 inch saws as well.