Alfa Tools HTSPT71359 11/16-18 Hss Special Thread Tap-Taper Hand tap - special thread 11/16-inch-18 tap size, taper style Taper taps (7 to 10 threads); longest chamfer insures easier starting General purpose taps can be used by hand or under power, in through (open both ends) or blind holes (closed one end) Quantity -1 per pack