A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-622-3588
NSN 4140-01-201-7960
NSN 5990-01-255-7387
NSN 6110-00-279-5613
NSN 5920-00-106-1454
NSN 6620-01-542-8709
NSN 4140-00-678-5264
NSN 5945-01-253-4299
NSN 6240-00-491-7191
NSN 6135-01-275-1363
NSN 5990-00-419-7584
NSN 5999-00-622-9310