Feature●Carbon Steel●Hand Tap●4-40●Number of Flutes 3●Carbon Steel Hand Taps are used to re-thread damaged and/or jammed threads. Carbon Steel Hand Taps may also be used to thread mild steels. Taper Style: Starts the thread square with the workpiece. Plug Style: Generally used in thru holes. Bottom Style: Generate the thread to the bottom of the hole.Description Carbon Steel, Hand Tap, Size: 440, Number of Flutes 3