A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-230-2292
NSN 5925-01-472-4642
NSN 5990-01-257-8299
NSN 5915-01-286-7771
NSN 6645-00-258-8547
NSN 5998-01-631-3901
NSN 6135-01-068-0119
NSN 5999-01-242-9854
NSN 5915-01-106-3705
NSN 6685-01-208-7536
NSN 6145-01-425-3373
NSN 6620-01-576-7723