A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-425-1191
NSN 5930-01-236-3832
NSN 6610-01-188-1550
NSN 5895-01-615-8346
NSN 5996-01-318-3163
NSN 6620-01-093-1383
NSN 6220-00-778-7213
NSN 5950-00-255-3734
NSN 5985-01-565-5983
NSN 5975-01-139-0121
NSN 5905-01-157-9611
NSN 6220-01-232-9947