A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-459-7961
NSN 6685-00-754-7495
NSN 6110-00-657-4739
NSN 5915-01-074-4298
NSN 5930-00-451-8233
NSN 5855-01-513-1859
NSN 6620-00-028-3370
NSN 6620-01-431-9176
NSN 2925-01-025-0082
NSN 6135-00-295-2614
NSN 6145-00-404-7927
NSN 5910-01-088-4894