EazyPower 82661 IsoMax SAE Hex Die, 1-7/8" Hex, 7/8-9 NCEazyPower IsoMax SAE Hex Die is ideal for routine maintenance, repair work and for rethreading where high accuracy and tolerance thread is not critical. Thread size: 7 8 9 NC (National Coarse) Fractional Hex Diameter: 1 7 8" Tungsten steel heat treated Used for plumbing, maintenance and repairs. WARNING: This product and the dust created by its use may contain chemicals including lead known to the State of California to cause cancer birth defects or