RFBs are pre-cut threaded rod, supplied with nut and washer. For use with Simpson Strong-Tie Adhesives. May be ordered in bulk without the nut and washer. Use with Simpson Adhesives to anchor into existing concrete and masonry. Offers a complete engineered anchoring system when used with Simpson anchoring adhesives. Inspection is easy; each end of the threaded rod is stamped with rod length in inches and ???No-Equal??? symbol for identification after installation.