A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-224-3581
NSN 5999-01-145-0355
NSN 5910-01-067-8361
NSN 6320-00-456-2092
NSN 6220-01-350-8014
NSN 5895-01-172-3203
NSN 5999-01-201-8643
NSN 5855-01-631-4331
NSN 6620-01-258-8980
NSN 6135-01-340-2599
NSN 7035-00-946-2642
NSN 5930-00-528-9728