The Centering Hub and Pin are used to align our Universal Router Plate and your router's collet for maximum concentricity in your set-ups. They can be purchased either individually or together, using the drop down box below. Many of our products benefit from the use of these parts, including the Clamp Interfaces, Off-Fence Mortising Kit, Ellipse Jigs,and Precision Template Guide Bushings. The aluminum Centering Hub is made to fit the standard Porter Cable 1 3/16" template guide bushing diameter. The stainless steel Centering Pin has a 1/4" shank and a .156" pilot pin that is mated to our Template Guide Bushing Centering Hubs.