An item for connecting two sets of grooves/keys (as of different diameters), changing groove/key size and/or spacing, or for changing groove/key configuration for uses not originally intended.
NSN 4140-00-258-3612
NSN 6650-01-469-5651
NSN 6645-00-066-6868
NSN 5999-00-344-1909
NSN 4140-01-327-1099
NSN 6150-01-068-8271
NSN 5990-00-407-4473
NSN 6105-01-442-0649
NSN 5905-01-603-7868
NSN 6110-01-437-7666
NSN 5990-00-768-9341
NSN 5835-01-232-2726