Dormer 5974063 is an E071 straight flute tap set for #12-28 UNF threads. This 3-piece HSS set includes taper, plug, and bottoming taps for through-hole and blind-hole applications. It features 4 flutes, bright finish, 2-3/8 in overall length, 0.81 in thread length, H3 thread limit, and #15 tap drill size.