Title: Not worth buying.
Product review: This is a die cast part and not strong. I was using them for deck stair layout. When tightening the thumb screw by hand the Stair Gauge snapped in half at the slot. The exposed metal was that grainy, dry look of what is generically referred to as pop-metal which is exactly what this did. In addition, the thumb screw end is not deburred and has the rough edge of the rolled threads. I cleaned this up on the strip sander when I bought them. I replaced these gauges with the Swanson SG0020 Solid Brass Stair Gauges. They're made from brass hexagon stock, machined on a lathe and also with a slot cutter. The thumb screws are machined with smooth ends so not to damage your square. There are many choices which are much better than the Adjustable Clamp 2Pc Adjustable Square Gauge 9249.
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