A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-541-5031
NSN 6610-00-572-1284
NSN 7035-01-081-5797
NSN 5895-00-778-7300
NSN 6135-00-318-8359
NSN 5915-01-443-8217
NSN 6685-01-521-3660
NSN 5910-00-051-6253
NSN 5855-01-034-3845
NSN 5998-01-413-2815
NSN 5985-00-175-4854
NSN 7035-01-231-0336