T and b grounding hub has a trade size of 1/2 in and is made sturdy, corrosion-resistant zinc for increased durabilityHub comes with thermoplastic insulating throat to protect wire abrasion and an embedded nitrile ring to ensure watertight seal
T&B® H050GR-TB Grounding Hub With Thermoplastic Insulated Throat, 1/2 in Trade, Threaded Connection, Zinc