A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-064-4165
NSN 6650-01-032-1786
NSN 6135-01-392-8344
NSN 6610-01-327-3187
NSN 6220-00-484-2536
NSN 6220-01-442-0437
NSN 5990-01-598-8769
NSN 6650-00-804-2039
NSN 5990-01-411-5930
NSN 6105-00-116-7843
NSN 5999-01-016-8795
NSN 6150-01-250-9831