Plug Style: Generally used in thru holes.
. 5-44 Carbon Steel Hand Tap Set Carbon Steel Hand Tap, Set includes Taper, Plug and Bottoming Taps, #5-44, Number of Flutes 3 Taper Style: Starts the thread square with the workpiece.Bottom Style: Generate the thread to the bottom of the hole. Carbon Steel Hand Taps are used to re-thread damaged and/or jammed threads.