This is the brake washer used on D/ GP/ A/ G/ 60/ 70/80/520/530/620/630/720/730/820/830 tractors. Brakes with the separate brake pinion gear use this washer under the nut. Later, with the nut to the outside of the drum, it is used again under the nut. This washer is not standard and is no longer available at Deere. We also sell as a 2 piece kit (see GP-D136R2PK).