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Finally got around to using this on a few rectangular slots that were too tight, and it evened them out perfectly without any hassle. The steel feels sturdy in the hand, and the shape really does help with getting into corners.

I was skeptical about the odd equaling shape but it's become my go-to for sharpening mower blades and cleaning up rectangular slots. The edges hold up well after several uses, no rounding off yet.

I bought this to clean up the square slots on a jig I'm building and it filed them dead flat in just a few passes. The cut is aggressive enough for aluminum but still leaves a smooth finish on brass. Wish the handle grip was a bit thicker, but that's a small gripe.