SU series Twist drills for general applications For high-speed machining of steel and stainless steel. Longer tool life with AlTiN coating. Diameter range 0.9–20.0 mm (3xD, 5xD, 8xD) S cut SUK series Twist drills for machining of cast iron Special cut for cast iron with ductile iron and malleable cast iron. Improved tool life due to impact resistant cutting edges. 1538SU S cut For cast iron Form D: Cut for cast iron SU K Twist drill SUK: all articles on demand Please add K when ordering: 1534SUK03-0100 C 31