Abstract: A woodworking jig has a pair of horizontally elongate co-planar router plate guide surface areas spaced apart from one another, with an elongate opening between the router plate guide surface areas, a workpiece clamp mounted below the opening, and a guide member support extending along the opening. Router guide members are releasably interengageable with the router guide to locate the router guide members in operative positions above the workpiece clamp and below the router plate guide surfaces.