I had 4 blades to do and 2 of the 4 had a big chip in the blades so I ground those two down with the 50 grit and the two that were not chipped were fairly sharp but not sharp enough to make clean samples, so withthose I started with the 400 grit and progressed to 600, 800, 1000, fine and super fine ceramics then the diamond paste strops with 1 and 0.5 micron pastes. I tried one of the knives at 15° but it was too acute and started getting micro chips as I went so I opened it up to 17° and that was the previous angle from what I found and it was what the knives liked. I love the 50/80 grit stones, they take a lot of work out of the initial bevel and pull out chips very quick. I could have done a much better job on them but they wanted to pay $10 per blade so I knocked them out in 30 min each.