A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-490-7096
NSN 6220-00-510-7899
NSN 5975-01-645-9285
NSN 5945-01-020-9877
NSN 6620-00-170-5296
NSN 7035-01-202-8172
NSN 6610-01-287-8559
NSN 6645-01-449-8752
NSN 2925-01-485-6982
NSN 6240-01-179-4547
NSN 5915-00-441-5849
NSN 6150-01-199-5351