CZTD10, for 10 piece tap index. Holds coarse & fine taps: 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, 1/2" - 20. All-steel tap cases. Each storage hole precisely sized for accurate, quick tool selection. Corrosion resistant, epoxy baked on coating. Secure, snap-lock steel cover. Rugged, heavy gauge all–steel case. Made in the U.S.A.