Hardness and knurling teeth are good, but borehole has a diameter of 6.16 and 6.35 (with rough surface). The knurtling wheels are coverd with a nasty rust prevent (take more than a 1/4 hour of cleaning). Deleivery was very fast.
Covered with some type of thick grease, which protect the rollers from rusting. After 10 minutes of cleaning with IPA and a scraper looking very good! :) I will try it and give additional feedback! Thanks!