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Always select the shortest drill possible for an application. The increased rigidity will dramatically enhance the number of holes per grind, as well as hole concentricity and location.
118° point angles are used primarily in softer materials such as mild steels and cast irons.
135° split points should be used to cut harder steel materials and especially in deep holes over 4 times the drill diameter. With a 135° drill point, cutting harder materials will produce thicker chips, minimizing work hardening of the cavity. The length of the lips on a 135° point drill, measured from the axis to the outer corners, is relativity short. This enables quicker penetration into the workpiece and reduces thrust and abrasion along the cutting edges.