A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-323-0901
NSN 5998-01-262-1164
NSN 5950-01-447-2839
NSN 5855-01-392-1110
NSN 7035-01-024-1771
NSN 6650-00-938-9233
NSN 5855-01-255-1688
NSN 6610-01-360-3564
NSN 6220-01-112-6919
NSN 6620-00-635-7347
NSN 5920-01-123-9854
NSN 6645-01-076-4655