Amazon.com: LE-JX 7402 Universal Outside Thread Chase Tools, Size (4,5,6,7,7 -1/2,8,9,10,11,11-1/2,12,14,16,18,20 and 24 Threads per inch) with 6 pcs Standard Dies Set : Automotive
STEELMAN 7/16-in to 8-in Split Die in the Dies department at Lowes.com