I got some lapping film in a PIF a while ago, 4/8/16/30 equivalent grits. I use them on top of a lapped 8x3" hone, but any flat surface will do. They may not offer the sexy smooth feel of a big dollar hone, but man they are effective, and the edges off the "30k" film is not that unlike a $350 Shapton 30k edge. Yes really. I have the Shapton 30k. Quite impressed. Best "bang for buck" honing solution for sure.