A pilot or spot drill, also known as a starter drill, is typically required when the succeeding drill is longer than 10xD or smaller than Ø 1.00 mm. Starter drills can also be used to improve hole location due to their short, rigid geometries.
Modular Turning Tools for most common spindle interfaces offers optimal tool length, large selection of insert types, approach angles, and a variety of standard boring bar and square shank adapters.
With respect to Prop65, our hardmetal and tooling/workholding products contain cobalt and nickel which are known to the State of California to cause cancer.