Guhring - #10-24 UNC 2B/3B 3 Flute Oxide Finish Cobalt Spiral Point Tap

Plug chamfers are the most commonly used chamfer and are designed for efficiently threading through and blind holes. They have 3 to 5 threads.

Oxide, also known as black oxide or steam oxide, is a surface treatment that prevents chip building, galling and welding on the workpiece. It is commonly used on low carbons, stainless steel and ferrous metals.

Cobalt is harder than high speed steel and provides better wear resistance. It is commonly used on high tensile alloys.