Special Hi-Moybdenum tool steel. Gold surface treated body and clearance for maximum lubricity. Heave-duty construction, 135 degree split point, no center punch needed, will not walk. Recommended for work hardening grades of stainless steel and other hard metal drilling applications. Type 135-AG. 1/4" Diameter. 2 1/2" Overall Length. 1 3/8" Flute Length.