Our 10-Piece Brass Template Guide Kit includes eight painstakingly machined guides with two precision locking rings. These guides fit a standard Porter-Cable style steped base plate opening with a large diameter of 1-3/8" and a small diameter of 1-3/16". The extra short barrel length on all of our guides (7/32") will allow you to follow templates as thin as 1/4". Common applications include: box joint, pattern work, dovetail, and mortise and tenon joinery. Fits the steped insert ring included with most router lifts like the Jessem Mast-R-Lift (RTL-003) and our Infinity Router Table Insert Plate (RTI-INF1) If your router's base plate is damaged or not compatable with these bushings be sure to check out our Universal Router Base Plates. We have multiple styles available for full sized routers and compact routers, and all are compatible with these Guide Bushings.