PORTER-CABLE 42040 3/4-Inch Router Template Guide
PORTER-CABLE 42040 3/4-Inch Router Template Guide;  Porter Cable 42040 Template guides are a great way to guide a router for a very controlled cut using a pattern or template. The guide attaches to the router base to keep the bit a specific distance from the templates edge while allowing the bit to cut in where needed.  Dimension:  OD 3/4",  ID 21/32",  Distance past base 7/32".