📏 HHIP 4101 0012 M2 Gage 0 251 - High-Quality Measurement Tool for Precise Machining Review

I have not used these pins but have bought a set of .061-.250 and .251-.500 and also all of these at the same time. Everything from one company. I've used some of the others and the pins were accurate. There is no reason to believe that they are different

Some of the pens I used from the set fit perfectly. They were all exactly 0.0002 minus the specified magnitude. The finish on the OD (OD) is great. The only thing I noticed is that the ends are rough. It's like they just got cut. But that's just cosmetic. It's good where it counts.

I work in a machine shop and so far this is enough to check most diameters we deal with. The only reason for the four star rating is that the ends of the pins are not cut perpendicular to the diameter, making it difficult to check the depth of the holes with these knobs.