A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-140-2452
NSN 6135-01-543-4256
NSN 7035-01-107-2811
NSN 6685-01-579-8452
NSN 7035-01-385-3628
NSN 6320-01-532-7491
NSN 5930-01-437-6156
NSN 6150-01-519-9309
NSN 5999-01-369-7006
NSN 6130-01-311-0175
NSN 5905-01-624-0330
NSN 6610-00-051-0989