The home Depot set fooled me. The pockets in the case are hex but the dies are round. Anyway you will find that theses sets include several thread pitches in each size. The assortment will cover anything on an old truck. They usually have 4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, and 1/2-20, 1/8 in. NPT pipe
