A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-440-7135
NSN 6135-01-100-3593
NSN 5895-01-444-3921
NSN 7035-01-440-8877
NSN 6320-01-433-1210
NSN 6220-01-173-3177
NSN 5935-00-828-1150
NSN 6650-01-145-5173
NSN 5925-00-522-2593
NSN 7035-01-592-2562
NSN 5925-00-162-2799
NSN 6135-01-307-2749