Plug Style: Generally used in thru holes.
. Carbon Steel Hand Taps are used to re-thread damaged and/or jammed threads. 12-28 Carbon Steel Bottoming Hand Tap Carbon Steel Hand Tap, Bottoming, #12-28, Number of Flutes 4 Taper Style: Starts the thread square with the workpiece. Carbon Steel Hand Taps may also be used to thread mild steels.