I randomly tested about a dozen of these pins from around the box. Everything measured as stated. Each pin is marked with its size. Each needle hole in the beautiful sturdy case is also marked with the size it contains. The housing cover holds the pins in its holes when closed. I think this is good value for money. Other Chinese kits can cost twice as much, and Starrett ten times as much. All pins are well lubricated; no rust. Based on what I received I recommend this set. I generally prefer to buy American/Starrett when possible, but that's fine for my hobby shop's needs. If you work on a manufacturing floor or have very high requirements this may not be enough, but for me the pins were measured exactly as marked, within spec. Certification wasn't included with the set, but for the price you can't really expect one.
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