Drills

Many different materials are used for or on drills, depending on the required application. Many hard materials, such as carbides, are much more brittle than steel, and are far more subject to breaking, particularly if the drill is not held at a very constant angle to the workpiece. Soft low-carbon steel drills are inexpensive, but do not hold an edge well and require frequent sharpening. Drills made from high-carbon steel are more durable than low-carbon steel due to the properties conferred by hardening and tempering the material. If they are overheated (e.g., by frictional heating while drilling) they lose their temper, resulting in a soft cutting edge.

-A special flute geometry ideal for machining.
-Improved surface treatment resulting in excellent chip evacuation.
-Point thinning generates superior centering and chip curling.
-Higher helix angle creates a lesser build up on edge.