Finished surfaces are square and regular. I have four of these and a screw hole on one clamp was cleaned. You need to tighten the screws. They are not suitable for smaller tube or rod, say less than an inch square when using MIG welding. It is too difficult to insert the pistol into the connection because parts of the mount interfere with the way. It's probably fine for TIG, but I haven't tried it by a small margin.
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