A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-00-807-9527
NSN 5950-01-088-8333
NSN 5930-01-487-7470
NSN 5996-01-545-5216
NSN 5965-01-367-9357
NSN 4140-01-548-8735
NSN 5996-01-076-2938
NSN 5905-00-811-3450
NSN 5855-01-392-1808
NSN 6110-00-734-4692
NSN 6150-01-078-2281
NSN 5925-00-311-2341