JessEm router table fences glide smoothly in tracks and anchor firmly with a twist of the molded lock-down knobs. It is a precision machined aluminum extrusion with red anodized finish. The PVC coated MDF fence face adjusts for varying bit diameters and has extruded shim-bars for jointing type operations. There are two 1/4 T-tracks above the fence faces for anchoring accessories. The molded 2-1/4 dust collection port mates with most shop vacuum hoses. It fits router table tops from 24 to 32 wide and 1/2 to 1-1/2 thick. It is an update to the very popular original, featuring a dual track fastening system with adjustable scales and a horizontal scale along the top face of the 3-5/8 high router table fence.