A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-642-1752
NSN 5985-01-285-0589
NSN 6240-00-197-6819
NSN 5945-01-159-6619
NSN 5985-01-025-1491
NSN 5999-00-437-5362
NSN 5915-00-283-8670
NSN 5925-00-192-4223
NSN 5905-00-093-7990
NSN 6220-01-643-8478
NSN 6650-01-412-4217
NSN 5998-00-756-2752