shape is square
NSN 5905-01-429-6066
NSN 5990-01-016-0245
NSN 6220-01-543-7937
NSN 6220-01-438-6613
NSN 7035-00-020-2227
NSN 5910-00-476-3950
NSN 5990-01-612-5323
NSN 6110-01-088-7198
NSN 6650-01-301-3959
NSN 5895-01-293-3732
NSN 6130-00-062-9921
NSN 6110-01-321-9126