Carrillo SPS rod bolts, they are used, but in excellent shape, used on H-Beam rods. They got replaced by one of our customers. They where stretched twice, once at build, then at one bearing change. The 16 bolts are identified on top as CARR SPS A54. Shipping to the lower 48 is included. More info from Carrillo, 7/16" bolt, Stretch from .005 to .008, or torque 100 foot pounds.