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 5990-01-248-8222
NSN 5905-01-020-9348
NSN 5965-00-458-7321
NSN 5999-00-243-8762
NSN 5920-01-394-9515
NSN 6650-01-333-1770
NSN 5935-01-654-5252
NSN 5999-00-266-3805
NSN 7035-01-438-2108
NSN 6645-00-960-6594
NSN 5945-01-269-0715
NSN 6620-01-527-9798