A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-01-429-0392
NSN 5950-00-411-4302
NSN 6150-01-200-6553
NSN 6240-01-548-9846
NSN 2925-00-365-3289
NSN 5920-01-220-3037
NSN 6145-01-643-9285
NSN 7035-00-973-9215
NSN 6610-01-525-4389
NSN 6105-01-406-3627
NSN 6645-01-550-9669
NSN 4140-01-602-5458