12-28 Left Hand Tap - Plug Style

Plug taps have 3 to 5 thread chamfer. The most common taps used for through holes and some blind holes as well. Plug taps also used for to start a thread.

High Speed Steel provides good wear -  resistance and can be used in general purpose applications for both ferrous and nonferrous materials.

Hand taps are for general purpose applications and hand tapping operations.