A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-459-8093
NSN 5920-01-479-5808
NSN 5950-01-415-2175
NSN 5910-00-175-7848
NSN 6645-01-223-2402
NSN 6220-00-433-3519
NSN 5960-01-047-3208
NSN 5985-00-832-0609
NSN 5975-00-842-5274
NSN 5855-01-308-0955
NSN 6135-00-078-9931
NSN 6610-01-602-3744