BTS-441. 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 15 degree angle in 7/16'' diameter x 1'' with four flats shank.
Wheel grit size suggest:
Part Code, Wheel grit size,
BTS-261. 50-60
BTS-441. 80-100