Infinity Tools スクエアコーナーチゼル

The squared corners come out absolutely perfect with this—just press it in and tap, no more fighting the rounded edges from the router. I've done three hinge mortises this afternoon and each one needed barely any cleanup.

I was tired of chisels slipping in rounded mortise corners, but this one locks in place on the first tap. The hardened tip cuts cleanly without needing much force, saving me time on hinge installs.

The squared tip digs straight into those router-rounded corners and cleans them out flush in one tap, no more fiddling with a regular chisel at an awkward angle. It’s become my go-to for hinge mortises, and the cut is so crisp I barely need to sand after.