#12 Pilot, 1/2" Diameter. 1/4x28 Thread. 3 flute, 100 degrees. Integral (fixed) pilot for cutting accuracy. Suitable for 3/16" riveting, or 10-32 AN507 Screws. High Speed Steel.
Specifications: 1/2" diameter (D) . 100° cutting angle (A) . 3-Flutes . 1/4-28NF thread (C) . Integral pilot