Cle-Force - 1/2-20 UNF, 4 Flute, Bottoming, Plug & Taper, Bright Finish, Carbon Steel Tap Set - Right Hand Cut, 85.73mm OAL, 1-21/32" Thread Length, Series 1699

Bottoming chamfers have 1 to 2 threads. Plug chamfers have 3 to 5 threads. Taper chamfers have 7 to 10 threads and are typically used as a starter tap. They all can be used for threading blind holes.

Carbon steel is a soft, durable metal. It is commonly used on abrasive materials, nonferrous metals, plastics and wood.

Bright provides a smooth, polished finish on the tool. It increases chip flow in softer materials such as aluminum, wood and plastic.