I'm often asked what we can or can't sharpen. We can sharpen a lot of things so the list of things we can't is a lot shorter!
Here are some common items we can't sharpen and pictures of them:
Helical push lawnmower blades, we do sharpen regular lawn mower blades if you remove them first. 
Tiny or micro serrations and some steak knives serrations if they are really small serrations.
Circular saw blades (talk to Eastside Saw for those)
-----------------------------------------------
YES, we can sharpen these unusual items:
Swords, Straight Razors, Pinking Shears, Mandalin Blades, Garden Tools, Skewers, Blender/Food Processing Blades, Single-bevel knives, Ceramic knives, Paper Cutters, Leather Tools, Chisels, Convex blades or scissors...