Large Steel Pinion Spur Gear 20-Tooth 4.5" Keyed Bore Hub 11" OD

New Old Stock.  -No part # on gear.
20-Tooth.
4-1/2" Bore Dia.
7-1/2" Length Thru Bore.
1" Keyway width.
11" OD.
Teeth spacing is 1.69" center to center.  (43mm)