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Titanium Coated, High Speed Steell Straight or Spiral Flute Step Drill for Metal, Sheet Metal, Plastic & Wood. Titanium Coated High Spead Steel Step Drill. Straight or Sprial Flute are avalilable for selection. A point angle of 118 degree to reduces friction, pressure and heat while centering in the material. Driling for Metal, Sheet Metal, Plastic & Wood. Great-heat treament and sharpened flute for durable and sharpenness. High quality for long time use.