I can't find anything about ON-GRADE anywhere. I went to Columbia's site could not find anything.
Don't know what it means. see:
Anyone have an idea, got it from HD a few months ago for 51 cents before they stopped doing 51 cents..
The 51 cents were for the remnants of what someone already paid for. ie they bought a full sheet but only needed a portion of it and had it cut.. the rest would go to .51 or 1.02.. no more. Now HD wants 70% of the retail value.