Flexible, cold rolled, hardened and temperedChamfered ends simplify insertion Diameter = 1/16 in, 5/64 in, 3/32 in, 1/8 in, 5/32 in, 3/16 in, 7/32 in, 1/4 in, 5/16 in, 3/8 in Includes = 4 Lengths Included for Each Size, Plastic Box Material = Spring...