Holds National Fine sizes: 6-40 tap #33 drill, 8-36 #29, 10-32 #21, 12-28 #15, 1/4″-28 #3, 5/16″-24 #I, 3/8″-24 #Q, 7/16″-20 #25/64, 1/2-20 #29/64 National Coarse Holds sizes: 6-32 tap #36 drill, 8-32 #29, 10-24 #25, 12-24 #16, 1/4″-20 #7, 5/16″-18 #F, 3/8″-16 #5/16″, 7/16″-14 #U, 1/2″-13 #27/64 Conveniently combines taps with the corresponding tap drill alongside of one another Each storage hole precisely sized for accurate, quick tool selection Raised embossed lettering for permanent identification Corrosion resistant, epoxy baked on coating Secure, snap-lock steel cover Rugged, heavy gauge all–steel case Clips mounted in the cover provide a handy place for securing your T-handle or adjustable tap wrench.