A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-056-1164
NSN 2925-01-197-7864
NSN 5855-01-384-4914
NSN 5975-00-918-2965
NSN 6645-01-252-9659
NSN 6130-01-409-1443
NSN 5960-01-081-6439
NSN 6135-01-204-8712
NSN 5925-01-500-1352
NSN 6620-01-021-8906
NSN 5910-00-122-5460
NSN 5950-00-732-0534