This is a set of 18 Lathe Collets ranging in size from 1/16" to 1 1/8", all seem to have 5C on them except the 1/2 Has Hardinge on it. 13 are in what I consider original wrapping. This is not an area that I have a wide knowledge of, so ask any questions and I will try to answer. They are in 1/16 increments.