Betterley Tru-Cut Blade Insert System. Fits Jet Right Tilt 10 inch Cabinet Saw (Xacta), Contactor Saw, General 50-250 and General 50-175 Patented design is precision engineered to maximize the performance of your table saw and blades Machined flat aluminum, mirrors table surface completely to blade, giving unparalleled support Leveling system insures accuracy, spring-loaded side plungers position insert, prevents vibration Significantly increases safety and decreases kickback, pre-machined for factory splitter/guard Insert measures 3-9/16" x 12-1/2" - Will not fit the Deluxe Xacta Saw with a riving knife.