A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-921-7941
NSN 6650-01-535-9190
NSN 5835-01-525-3220
NSN 5920-01-114-2647
NSN 5975-00-189-0093
NSN 4140-01-431-6560
NSN 5855-00-237-4088
NSN 6135-01-539-0013
NSN 5915-01-010-6923
NSN 6320-01-183-8196
NSN 5920-00-757-6144
NSN 2925-01-513-9114