These brackets are made from hardened aluminum alloy, have a machined square and are red anodized. They are very durable and precise in woodworking. At 4.7 inches, they're a bit smaller than some other aluminum clamp angles, but the effective difference is minimal in my opinion and not necessarily worth the extra fee for the potential extra inch. This set is also supplied without clips. But I'm not a big fan of those L-bolt style clips that connect to those kind of squares. I have found that spring clips or small ratchet clips will do and are much easier to use. Another nice feature is the recessed holes for flush mounting if you screw it on like a mounting bracket. If you really don't need (slightly) large squares or clamps, I would recommend these as they are just as accurate but cost under $20 rather than double or more.
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