A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-640-7240
NSN 6650-01-302-3562
NSN 6105-00-248-5772
NSN 6645-01-261-6903
NSN 5930-00-104-8619
NSN 5920-01-493-3938
NSN 5950-00-937-1177
NSN 5990-01-167-7043
NSN 6320-00-790-4844
NSN 5935-01-204-8333
NSN 6240-00-099-8606
NSN 5990-00-939-0461