Here is a perfectly flat, rigid and durable mounting solution for reliable use in any router table application. The Insert dimensions of the Rout-R-Plate are the same size as our Mast-R-Lift II and Rout-R-Lift II and will also fit our model #03006 solid phenolic Mast-R-Top. The Rout-R-Plate includes a convenient center hole bushing used to align the router so it is centered in the bit hole. Simple step by step instructions make accurate drilling and mounting any router easy to accomplish. The plate center hole is machined to accept a 3-1/2" raised panel bit and includes two additional insert rings. Additional insert rings sets are available separately.