10-Piece NC & NF Rethreading Die Set, 1/4"–1/2" from 1282 /per Qty. Add to Cart This item is currently on backorder, but you can still purchase it now and we'll ship as soon as more become available. Ten most popular sizes of thread-restoring dies for home repairs 5 NC Coarse (1/4"-20 tpi, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13 tpi) and 5 NF Fine Dies (1/4"-28 tpi, 5/16"-24, 3/8"-24, 7/16"-20, 1/2"-20 tpi) Packaged in soft plastic resealable pouch: 3" x 4½" NC dies are silver zinc–plated, and NF dies are black oxided to easily tell them apart from gold zinc–plated metric dies Will not crosscut or undercut the thread the way a cutting die will NOTE: Not guaranteed when used on hardened threads or to cut new threads. Weight: 0.19 lb MADE IN USA SKU:CF10