The Allied Bolt Type T Porcelain Knob (Vendor P/N 971, Millennium Part #528430) is used to anchor drop wire directly to the side of a building, working together with a 3/8 inch angle screw to secure up to two drop wires per knob. Its durable porcelain construction resists weathering, UV exposure, and electrical stress, making it a long-lasting choice for aerial line hardware installations. This knob is a staple for telecom and utility technicians terminating service drops at residential and commercial structures. Priced per each, it's an economical, dependable component for any aerial hardware inventory.