BTS-411. Twin Plate Grain Dressing Blade Tool

Twin plate grain dressing last twice as long dresses twice as fast.
Plates 10mm x 20mm Mounted on the each side of the blade.
6.3mm x 22mm x 19mm blade is set at 0 degree angle
in to 7/16'' diameter x 1'' with four flats shank.
Wheel grit size suggest:
Part Code, Wheel grit size
BTS-259. 50-60
BTS-411. 80-100