A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-416-6324
NSN 4140-01-336-7722
NSN 5920-01-503-0429
NSN 6320-01-449-0043
NSN 5975-01-050-7785
NSN 6620-00-928-0227
NSN 6150-00-103-1957
NSN 6650-00-947-3047
NSN 5975-01-108-0136
NSN 5855-00-058-1293
NSN 6685-01-650-5326
NSN 5990-01-485-8874