Eliminate friction- router rides on a "cushionin of air Improve accuracy of cut- machined flat aluminum plates provide a true, flat base Durable- strong phenolic sub-base stays flat Stable- large 7" diameter base Versatile-works on solid surface, laminate, wood and flat surface Reduce scratches-air flow prevents debris from lodging under base Improve quality of cut-allows you to control cut with resistance of cutting bit, not friction on router base Easy installation-mounts directly to your router without modification Standard Equipment: 1-3/16" hole phenolic sub-base Air valve 10' long air supply hose Mounting hardware (May be drilled to fit other routers) Mounts to Router Bases: Porter-Cable: All with 6" and 7" diameter bases, Bosch : 1617 and 1618 Series; 1619EVS, Makita : RD1011, RF1101, RP1011, Milwaukee: All 56 Series, Dewalt : DW6 Series