RFBs are clean, oil-free, pre-cut threaded rod, supplied with nut and washer. Offers a complete engineered anchoring system when used with Simpson Strong-Tie adhesive. Inspection is easy; the head is stamped with rod length and “No Equal” symbol for identification after installation. RFB 1/2 in. x 7 in. Hot-Dip Galvanized Retrofit Bolt (Pack of 50).