These wrenches are not worth buying for any industrial or scientific use. The jaws failed to grip tightly and kept slipping making it impossible to tighten bolts or nuts .The only good thing about them is that they are affordable, but the cheap price is not worth the potential damage to your equipment. Save yourself the headache and invest in higher quality tools..
There is no manufacturer name on it. The label says Made in India. Lots of play in the key and no way to thumb-tighten the adjustment. The chrome part is completely scratched. My Harbor Freight wrench has less play and looks better. For the price, it's not worth the hassle of sending it back. I wouldn't buy anything else.