Porter Cable 42700 - Edge Guide. This edge guide features solid construction, with an anodized, extruded aluminum body for strength and durability. The dual sliding and lockable adjustment mounts, let you quickly slide the edge guide to the general area needed. It features quick and accurate operation. Once you lock down the first slide and rotate the fine-adjust knob, the edge is exactly where you need it. The adjustment scale is in both fractional and metric increments. It will fits Porter-Cable routers, model no. 7518, 7519, 7529, 7536, 7537, 7538 and 7539.