A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-00-451-0709
NSN 6320-01-383-9979
NSN 6105-01-249-3365
NSN 2925-01-467-1192
NSN 5999-01-265-0349
NSN 6320-00-593-0379
NSN 5950-01-243-0835
NSN 5990-00-170-4239
NSN 6110-01-424-4792
NSN 5930-01-480-6240
NSN 2925-01-239-6044
NSN 5990-01-113-8121