US PRO UNC UNF Tap and Die Set 1/4, 5/16, 3/8, 7/16 & 1/2 24pc 2621 Imperial
Part No 2621. Tap & Die - 1/4" UNF x28. Tap & Die - 5/16" UNF x24. Tap & Die - 3/8" UNF x24. Tap & Die - 7/16" UNF x20. Tap & Die - 1/2" UNF x20. Tap & Die - 1/4" UNC x20. Tap & Die - 5/16" UNC x18.