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.
Micro pilot drill geometries with 1-2xD flute length, large point angle, and positive diametrical tolerance allow them to optimize the guidance of a succeeding drill.
Micro Spirec drills are a cost-effective solution to a broad range of applications due to their relatively low price, number of diameters, and availability.