The Bosch quick-change template system makes it easy to switch out template guides—just pull on the lever and the guide drops out. The kit includes the RA1126 Quick-Change Template Guide Adapter, which accepts Bosch RA-series template guides (sold separately in a wide range of sizes), plus the RA1100 Interface for Threaded Template Guides, which accepts threaded template guides that fit into a 1-3/8'' recess, such as those used on Porter-Cable routers. Compatible with many Bosch routers, including the 1613AEVS, 1617-, 1618-, 1619- and MR23-Series routers, as well as the plunge bases on Bosch palm routers.