EZSMART Universal Saw Base, Model EZUSB Universal saw base fits over your circular saw base to perfectly align blade and dramatically improve cutting Produce perfectly clean cuts with minimal tearout both off or on any EZsmart guide rail. Includes advanced features including the FIN which cuts your cutline open, vitually eliminating kickback and antichip edges to reduce tearout Fits most 6 1/2, 7 1/4 and 8 1/4" circular saws as long as the saw base is no larger than 12.69 x 7.1"