Product details:

Ideal for stair pattern and hinge routing dovetailing and craft/hobby work. Fits any base with a 1-1/4 diameter center hole. Also available from the Guide Bushing Router Plate sold separately. Affordably priced and designed with maximum utility in mind this router plate features a 1-1/4 center opening to accept guide bushings and a ring of external mounting holes which forms multiple patterns to allow attachment to most popular routers. Six additional holes are dispersed evenly around the center to provide an escape for routing debris.