Explain Router Offset and Jig Function

What happens here

The presenter demonstrates that the initial appearance of the jig might suggest it's too large for the metal insert. However, he clarifies that this is intentional due to the router's offset. He shows the base plate of a compact router, specifically pointing out that the distance from the edge of the router's base plate to the cutting edge of the router bit is 1 and 3/4 inches. This offset means that when the router's base plate follows the inside edge of the jig, the router bit will cut a path 1 and 3/4 inches inwards, creating a smaller, perfectly sized recess for the metal insert.

Goal: Understand the router's offset and how the jig compensates for it