
I am a professional diesel mechanic and bought these to try them out. I have had them on my 3/8 impact and with an adapter on my 1/2" impact. They have some minor flexing on stubbord bolts but that will happen. Their finish is incosistent. I have both the metric and standard set and some are shiny black and some are matte. Its not a big deal but it makes me wonder as to what went wrong in the manufacturing process.Overall they are good for occasional proffesional use.

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