A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-056-1335
NSN 7035-01-441-3188
NSN 5960-00-678-9851
NSN 5975-01-305-8185
NSN 6145-01-166-6188
NSN 6620-01-077-8033
NSN 6620-01-266-5545
NSN 5965-00-255-3889
NSN 5945-01-422-1684
NSN 5985-01-273-0938
NSN 5999-01-457-9670
NSN 6645-01-569-0491