I am looking for some 1 X 30 inch very fine sanding belts.

I use them on a bench sander to sharpen knives, and would like to find some
belts with the finest grit possible, 400 would probably be ideal.

Have gone to Lowe's and HD web sites and they don't have anything in a fine
grit. Went to a Harbor Freight store, no luck there.

Anyone have any ideas where I can buy some?

Thanks in advance,

Bob-tx