A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-423-1085
NSN 5950-01-420-5166
NSN 5905-00-623-8700
NSN 6135-01-481-7400
NSN 5895-01-566-6242
NSN 5998-01-485-3695
NSN 5975-00-448-6756
NSN 5915-01-576-8602
NSN 5855-00-832-9341
NSN 5950-00-236-0252
NSN 6105-01-433-4232
NSN 6150-01-303-7080