Alfa Tools HTSPP71343 9/16-28 Hss Special Thread Tap Plug Hand tap - special thread 9/16-inch-28 tap size, plug style Plug taps (3 to 5 threads); most common chamfer used in through or blind holes 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