I see several dissatisfied w this KO set. One said:"Showed up on time but when I got the item it was millimeter instead of standard measurement sending it back." Another had the same complaint.Apparently they did not even bother to TRY the punches or, to see if they worked.I don't care if they are METRIC or SAE/INCHES. DO THEY WORK? Are they UP TO THE TASK?It certainly appears to be the case, according to the bulk of all the reviews.I am an ELECTRICIAN like many here who have written good to great reviews about this product. That was the MAIN SELLING POINT of this PRODUCT for me.If these KO PUNCHES actually create CLEAN HOLES in ELECTRICAL PANEL BOXES, which are like Baby Bear's porage, his chair and bed..."Just right!"Not to tight and not too loose for EMT, ENT, HW connectors, threaded and chase nipples (etc); AND they actually KEEP their CUTTING EDGE through multiple cuts. Then again, I have enough BRAINS, I possess sufficient adaptability skills and I'm not hung up on SAE vs METRIC, that I would be more than happy to give these punches a try as well.I somehow lost my 1-1/2" & 2-1/2" Greenlee punches some time back, and now discovered that frustrating fact.And there's no way I'm paying what Klein or Greenlee are expecting me to fork out for these punches. They are good tools to be sure. But I hardly use my 1/2" thru 1-1/4" Greenlee set & 2" Greenlee KO punch now. So I don't need a GREAT (and expensive) SET. Just something that works well as many times as I need them on rare occasions. If I found I was punching holes every day numerous times - AND THIS SET began to fail too quickly. Then I'd think about investing in a Greenlee or Klein set.
Fabrice 
