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This Shinwa aluminum square is a well-built tool from Japan's leading measuring instrument maker.
It's got a 60cm nominal length (655mm total) with a 30mm width and 20mm thickness—sturdy enough to use as a guide for a circular saw.
The angle scale reads from 20° to 120° in 1° increments, and you can move the rod to either side for easy symmetrical alignment.

What's nice is the brass screw and plastic washer that keep it locked tight so it doesn't shift while you're working.


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4.4 out of 5