A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-160-7934
NSN 6620-01-067-8336
NSN 7035-01-116-6223
NSN 6130-00-034-5127
NSN 5925-01-272-9577
NSN 5930-01-176-2381
NSN 6610-01-233-5857
NSN 6220-00-222-7426
NSN 5915-01-519-2234
NSN 6685-01-401-5360
NSN 5855-00-327-2112
NSN 6145-01-442-8143