Tap, 3/8"-20 Thread, Plug Style, Left Hand 

Plug taps are the most commonly used general purpose tap. They are recommended for tapping free machining steels, stainless steels, aluminum, zinc, and ductile materials.

Plug taps have 3-5 chamfered threads and are utilized in either through or blind hole tapping.

The High Speed Steel (HSS) construction gives good wear-resistance.

This is the 3/8"-20 left hand tap for the cross slide on the 20 TPI mini lathe.