Router Table Insert Kit 1/4"(6.35mm)*9"(228.6mm)*12"(305mm)(approx.) Ideal for making your own router table at home. Made from phenolic resin INSERT and adaptable to accept most common routers. Kit includes 2 removable rings 1-1/4"(32mm), 2-5/8"(66mm)and 3-7/8"(98mm) openings to accommodate larger router bits and starter pin for freehand work. Also included are 4 leveling screws and 4 rare earth holdown.