Disc Opener Blade. Fits John Deere Grain Drill Models 750, 1560, 1565, 1590, 1690, 1835, 1850, 1860, 1890, 1895 and 1990, Replaces OEM# N214190, N283804

Outdiameter : 18" Thickness : 5mm

4 equal spaced holes ( 0.42" bore) on pitch circle diameter 4-3/8"

Center hole size : 3"