5 pcs/set. Made from high-speed steel with ground threads. 52 Degree Helix Angle - Semi Bottoming with 2-2.5 Thread Chamfer.
Right-hand cut, square drive shank. Bright Finish. Can be used for plug or bottoming applications and allows threading close to the bottom in blind holes.
Spiral flute draws chips out of a relatively deep hole. Slightly longer chamfer distributes cutting over a greater number of teeth for increased production.