These are replacement safety chain u-bolts used on B&W Turnover Ball Gooseneck Hitches. They are manufacturer to the same high quality specs as the original 1900-2-1600 part that came with your original B&W Gooseneck Hitch.
Provides a reliable connection for gooseneck trailer safety chains
Spring-loaded design keeps safety chain loops snug against the truck bed
Protected by a durable zinc-plated finish
Includes two safety chain 1/2" U-bolts, four 1/2" lock nuts, four springs, one 5/16" x 3/4" carriage bolt, one 5/16" x 3/4" cap screw, one 5/16" flange nut