A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-01-303-7758
NSN 5905-01-052-7191
NSN 5935-00-643-7497
NSN 5990-00-038-0695
NSN 5935-01-180-3417
NSN 6685-00-386-9003
NSN 4140-01-077-7555
NSN 5905-01-138-6282
NSN 6150-01-634-0575
NSN 5835-01-216-1215
NSN 6135-01-273-1253
NSN 6610-00-398-0104