Overall I find the 8" combination stone size to be perfect. Its small enough to hold like a file when working larger tools or if a flat surface is unavailable, but big enough to spread the swarf out a bit. With a silicon carbide stone I actually prefer a 6" because with a good puddle of oil it doesn't matter where the swarf is building up and its very easy to keep the stone flat by moving around on it. I modeled my Washboard after the 8" Norton stones as its a good size for surface area, but not so large I'll be tempted to reach a bit and maybe mess up my angle control. I used to use 18" of bonded sanding belts on a brass plate for sharpening machetes and larger tools, but once learned to break the edge down into smaller overlapping stretches, a larger surface is not helpful.