A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-187-0211
NSN 6320-01-415-0953
NSN 6135-01-307-2749
NSN 5910-01-473-7329
NSN 6105-01-556-4228
NSN 6685-01-463-8461
NSN 6650-00-244-5648
NSN 5895-01-233-9423
NSN 5999-00-290-1860
NSN 6645-00-292-5053
NSN 6130-00-696-8309
NSN 6110-01-512-2008