Replaces Porter Cable 42237. This Template Guide Lock Nut is used when installing template guides for controlled cut patterns. A knurled surface allows easy hand tightening for quick adjustments with your template guide. Brass Router Template Guide. Replaces Porter Cable 42045. 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 template's edge while allowing the bit to cut into the workpiece. Features: For use with Stanley T-3 template For General Routing Fits Porter Cable and many standard routers Used to secure a template guide to the router sub-base when template routing Compatible with all Template Guides Precision Machined Brass for positive locking and durability Knurled surface for easy tightening Specifications: I.D. : 17/32" O.D. : 5/8" Height : 1/2"