Hand Taps are the most versatile taps for hand use, or for tapping under power. Hand Taps are popular for use in general machine tapping or CNC tapping. They are also appropriate for tapping the vast majority of materials in through or blind holed conditions. For Taper taps, add this: Taper Style - Starts the thread square with the work piece. For Plug Taps, add this: Plug Style - Generally used in thru holes For Bottoming Taps, add this: Bottom Style - Generates the thread to the bottom of the hole