Drill Set High Speed Steel Metric 29 piece 1mm - 3mm in 0.25 increments and 3.5mm - 13mm in 0.5 increments
The Blue Bullet finish is a ferric oxide surface coating which resists chip build up on the cutting edge, reducing frictional drag, and therefore reducing heat generated. It greatly increases drilling life and ability, especially in ferrous materials such as steel, stainless steels, high tensile steel, alloy and tool steel.
Features and Benefits.