Feature:1. Titanium Plated High Speed Steel: Drill bit is made of titanium plated high speed steel have higher hardness and wear resistance2. 118° X Type Opening Design: Adopts 118° X type opening design, which can effectively prevent the bit from slipping3. Double Straight Flute: Double straight flute step drill bit can not only drill quickly, but also unhindered chip evacuation4. Easy to Use: This step drill is step size, easy to use, sawing and drilling, drilling and milling, fast and efficient5. Wide Applications Range: Widely used for slotting, reaming and punching of thin wood, metal, and plastic plates, etc.Specification:Item Type: Straight Flute Step Drill SetMaterial: Titanium Plated High Speed SteelShank Type: Round Shank4mm-12mm Step Drill Bit: Blade Diameter: Approx. 4mm / 0.16in, 6mm / 0.24in, 8mm / 0.31in, 10mm / 0.40in, 12mm / 0.47inTotal Length: Approx. 65mm / 2.56inShank Diameter: Approx. 6mm / 0.24in4mm-20mm Step Drill Bit: Blade Diameter: Approx. 4mm / 0.16in, 6mm / 0.24in, 8mm / 0.31in, 10mm / 0.40in, 12mm / 0.47in, 14mm / 0.55in, 16mm / 0.63in, 18mm / 0.71in, 20mm / 0.80inTotal Length: Approx. 73mm / 2.87inShank Diameter: Approx. 8mm / 0.31in4mm-32mm Step Drill Bit: Blade Diameter: Approx. 4mm / 0.16in, 6mm / 0.24in, 8mm / 0.31in, 10mm / 0.40in, 12mm / 0.47in, 14mm / 0.55in, 16mm / 0.63in, 18mm / 0.71in, 20mm / 0.80in, 22mm / 0.87in, 24mm / 0.94in, 26mm / 1.02in, 28mm / 1.10in, 30mm / 1.18in, 32mm / 1.26inTotal Length: Approx. 101mm / 3.98inShank Diameter: Approx. 10mm / 0.40in3mm Saw Drill: Blade Diameter: Approx. 3mm / 0.12inTotal Length: Approx. 60mm / 2.36inShank Diameter: Approx. 3mm / 0.12in6mm Saw Drill: Blade Diam