Dream drills for aluminum with coolant holes. Right hand spiral, 30 degree helix. 118 Degree point angle. Made of Carbide. DLC coating. Shank tolerance ød2: -0.0001/-0.0005. 5xD. The tool has the special flute shape and geometry for suitable machining of aluminum. Excellent chip evacuation due to better surface treatment. Point R-thinning makes the superior centering and chip curl. Pecking not required.