To thick for the standards around here. .09" spine and I only took it to. .025" for the cutting edge. I've never made an edge that thin so I held back a bit. I'm working on one now that I hope to get down to. .010" before I start putting a handle on it. I've got to work up my confidence level going that thin on an edge. A long time ago I did some filet knives before and they were near zero, but they were made out of 1 1/2" wide band saw blades from our shop. Never heat treated them, just left them as they were.