A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-519-8767
NSN 5855-01-041-9392
NSN 6610-01-633-8931
NSN 6220-01-482-6113
NSN 5905-01-327-2255
NSN 5975-01-528-4881
NSN 5950-01-398-9557
NSN 5855-01-109-1807
NSN 5998-00-633-5169
NSN 2925-01-359-4027
NSN 6645-01-537-1066
NSN 5965-01-422-7638