Ideal for portable or machine drilling. 3/64" Cobalt Heavy Duty Split Point Stub Drill Bit Screw machine drills (also know as stub or stubby drills) are manufactured to Aerospace Standard 907. Screw machine drills are popular in the automotive and construction industries. Sizes smaller than 1/16 and larger than 1/2 have the 118 degree standard point The 135 degree split point is self-centering and reduces thrust.