Quick router template for cutting mortises for 4 inch door hinges. 0.5 inch thick for use with a 1/2in cut-length of top-bearing-bit. Depth is adjustable by moving the fence attached to the bottom with 2x 1/4-20 (or any smaller size ) screws. The slots are 7/16 wide to be able to capture the head of a 1/4-20 bolt.

The template is reversible, with rounded corners in one orientation, and square corners in the other.