Bushings and router not included This baseplate only fits the Ra1166 plunge base, it will not fit the 1617evs static base. If you need a baseplate for the static base please use our other listing. Use this baseplate with the Bosch Ra1166 plunge base attachment. This baseplates bushings are centered to compensate the manufacturers error and no adaptor is needed. The bushing hole is machined to high tolerances and accepts all pressure fit threaded bushings.