Very convenient, good construction.
As others say, it will not leak oil from your construction.
For household use, to make something for your hobby, they are good.
They helped me a lot

Good for its price. It is not suitable for heavy use, only for amateur use. It is user-friendly but not durable.

For the money and their opening, they are very good. They cannot tighten too tightly (like all cheap clamps) but they tighten well enough for any woodworking and light engineering work. Additionally, with a suitable adapter, two can be joined together to double the clamping length, ideal for large pieces.

Very good clamps for the price. They won't tighten as much as larger ones but they tighten enough for most jobs. And definitely the cost allows for many to be purchased, which is often more important.

Very good clamp. value for Money. Compared to other cheap ones, it is the best. I cannot compare it to expensive clamps because I don't have any. However, it does its job perfectly.

The one... broke with the first use. The upper arm came off and no longer stays in place, something probably happened with the button that you press to unlock and change the direction it faces.

Awesome clamp. Large size with easy lock/unlock and a stable grip with the material it holds. The price for what it offers is truly ridiculous. It's worth infinitely.