They work very well and I can't tell them apart from some of the more expensive sets I've used. I've built dozens of boxes over the past few years. (I'm a woodworking enthusiast). They are durable and true to size. 1/2" on each side for side mounting. The screws provided are very small. They may work but I decided to replace them with pan head screws. They are in my shop and the boxes will be well used and heavy. I didn't want any risking small screws. I have since bought them again. (Used a total of 30 so far.) I will buy them again in the future.
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