A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-116-3385
NSN 5990-01-354-8965
NSN 5910-01-480-8577
NSN 5855-01-452-0955
NSN 6610-00-686-5817
NSN 6150-00-464-6323
NSN 5855-00-361-0167
NSN 5965-00-529-0602
NSN 5945-01-274-5476
NSN 4140-00-800-7204
NSN 5905-01-152-8939
NSN 5925-00-302-4637