leading coil permitting it to en-ter the tapped thread. After in-stallation each high tensile stainless steel coil of the insert expands outward with a spring-like action permanently an-choring the insert. Size Range: • UNC #2 through 1-1/2 • UNF #2 through 1-1/2 • Metric Coarse M2 through M39 • Metric Fine M8 through M39