According to my experience the HHIP knurls provided an exceptional knurling performance for my indexable insert holders .I could easily achieve clean and precise knurls in a short amount of time, reducing the chances of rejection. The quality of the material used for the knurls is remarkable in terms of durability and longevity. However, the price may seem a bit high, but considering the benefits it provides, it's entirely worth it. Overall, the HHIP knurls are an excellent investment for those in the Industrial AND Scientific field looking to produce high-quality knurls for their cutting tools..