24-Piece NC & NF Rethreading Tap & Die Set (#66) from 4200 /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. 6 NC-USS Rethreading Taps and 6 NC Rethreading Dies (1/4"-20 tpi, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, and 9/16"-12 tpi) 6 NF-SAE Rethreading Taps and 6 NF Rethreading Dies (1/4"-28 tpi, 5/16"-24, 3/8"-24, 7/16"-20, 1/2"-20, and 9/16"-18 tpi) NC taps & dies are silver zinc–plated and NF taps & dies are black oxided to easily tell them apart NC taps and dies are in one telescoping clear plastic case (1½" square x 6" long), Weight: 0.68 lb NF taps and dies are in identical case, Weight: 0.69 lb Dies are on beaded chain MADE IN USA SKU:66