I have already bought a few "Yost" clamps. I've been happy with their value for money in the past. That being said the last 2 clamps I just ordered came without the black oxide coating on the acme threads. I only have a steel thread. It is not what is described, it is not what I have received in the past with the same SKU and should not be advertised that way unless you can expect it. The photos of the clamp show a black oxide coating, moreover it is mentioned more than once in the description. I'm not sure where the quality control was on this batch.
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