Item is round with a centrally located round aperture.
A metallic item usually flat, having toothlike projections on the periphery, specifically designed to engage a pawl for the purpose of regulating and/or locking a brake, clutch lever, or the like, in a definite position.
NSN 5945-01-050-9489
NSN 7035-01-395-0757
NSN 5975-01-258-5941
NSN 5935-00-079-9413
NSN 6110-00-737-8548
NSN 5965-00-226-7870
NSN 5990-01-527-4868
NSN 5999-00-929-0303
NSN 5945-01-024-6481
NSN 6650-01-596-1365
NSN 5930-00-466-3643
NSN 5960-01-013-9346