A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-030-0064
NSN 7035-01-411-6062
NSN 5855-01-384-3314
NSN 5915-00-483-2138
NSN 6685-00-358-1299
NSN 7035-00-371-7749
NSN 5960-00-888-7218
NSN 5925-01-394-4953
NSN 5950-00-205-2932
NSN 5990-01-170-6081
NSN 5930-01-525-7514
NSN 5975-00-935-5946