The first R8/ER40 I received had an ER .002" TIR socket mounted on a milling machine spindle. .0001" in the R8 socket cone , and pins in R8 collets are typically 0.0005" or less. I returned unit for exchange. Replacement shows ER socket TIR of 0.0002" to 0.0003" depending on voltage. The pin -Runout is 0.0002" to 0.0008" and dependent on the collet. The cosmetic and detailed finish of both units is excellent - very sharp detail and nice finish. The metal is hard and resistant to spindle and wrench marks. It feels looks like most of them are good, but for some reason some of them were done wrong.i rate this item solely on the quality of good.
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