5/8in-11 X 12in UNC HSS Pulley Tap.The long shank is also ideal for reaching holes inaccessible with standard length taps. Extension taps are furnished in several different overall lengths.
No special holder is required for this type of die, any wrench large enough will suffice. Ideal for maintenance in the shop or field. #8-36 UNf Carbon Steel Hex Rethreading Die.