Adjustable router jig for square holes or recesses - YouTube
Trend Adjustable Routing Jig Frame & Guide System for Creating Square and Rectangular Recesses, Slots, and Face Panel Molds with a Router, VARIJIG : Amazon.co.uk: DIY & Tools
Adjustable Dado Jig Plans — 3x3 Custom
My version of an adjustable router template using microjig matchfit hardware. : r/woodworking
Jig for Cutting Squares/Rectangles | Router Forums
Trend Adjustable Routing Jig Frame & Guide System for Creating Square and Rectangular Recesses, Slots, and Face Panel Molds with a Router, VARIJIG - Router Accessories - Amazon.com
How to Make an Adjustable Routing Template
Adjustable router template by Luka | Download free STL model | Printables.com