A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-429-9242
NSN 2925-01-394-5650
NSN 6645-01-051-1453
NSN 5990-00-530-3855
NSN 2925-01-580-1527
NSN 5945-00-679-3956
NSN 5990-01-105-5336
NSN 5998-01-281-0410
NSN 7035-01-144-6408
NSN 6220-01-281-8848
NSN 6135-01-027-7543
NSN 5998-00-285-3186