Huge, strong tested support for beams for welding, support bars for scaffolding that I walk on and nothing moves, the little plastic piece in front of the round foot melted on the 1st beam we welded, so it doesn't have any particular heat resistance.

Very good tool. Heavy, it seems to be made of good materials. It inspires confidence, as if it's telling you to tighten even more.

Really heavy-duty.
In the description it says up to 450 kilograms of pressure - which is more than enough for carpentry work - but they seem to withstand even more.
I am experimenting with some wood bending techniques using molds and glue, and they are ideal because they can withstand high pressure.
Their price at 18.50 that I bought them for this size and their sturdy construction is very good.