Back Home / Fasteners / Threaded Inserts / HELICALLY COILED INSERT KIT UNF 1/4″-28 HELICALLY COILED INSERT KIT UNF 1/4″-28 SKU: HCI14FK Categories: Fasteners, Threaded Inserts Made of stainless steel wire that has been rolled to a carefully controlled thread form. When installed, inserts adjust to a tapped hole, becoming a functional thread with a strength exceeding the original. Designed to repair stripped threads in a variety of metals, aluminum, aluminum alloys, steel and cast iron. Thread size:1/4″-28 Drill size: 17/64 Case Quantity: 1 Log In For Pricing