These are a bolt kit for the John Deere A/G/60 model Tractors. They are used to secure the flywheel to the crankshaft. The square head profile fits in such a way to prevent turning when tightening. Provided with each bolt is a lock washer and a GP-14H800 Nut. The finish in in black to be painted with the tractor when complete. These bolts are the correct size and type for this application.