A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-416-8342
NSN 6620-00-190-8109
NSN 6220-01-257-1075
NSN 6650-00-820-4577
NSN 6685-00-234-3394
NSN 5855-00-560-0110
NSN 5945-01-395-6254
NSN 6240-01-145-4916
NSN 6150-00-805-0808
NSN 2925-00-035-5633
NSN 6135-00-998-5884
NSN 5985-01-317-7970