The template is slightly oversize to allow for variations in neck width and finish thickness. To rout a smaller neck pocket, reduce the template size by adding a few layers of binding tape. To learn more see instructions.
Note: both the guitar and bass routs are shaped for necks with radiused heels (Strat®, Jaguar, P-Bass®, J-Bass®). The guitar rout is not intended for use with Telecaster-style necks (which have a square heel). Typical neck joint rout depth for a Fender® style guitar or bass neck is 5/8".