This long aluminum runner adjusts from the Top for perfect sliding action in any standard 3/4" x 3/8" miter gauge slot. Won't warp, shrink, or swell like wooden runners. A simple turn of a screw adjust Miter Slider for ZERO sideplay. Another turn locks it securely in place for stationary jigs such as feather boards. Includes FREE illustrated plans for using a wide variety of shop-made jigs and fixtures like the miter jig shown in the photo.