Features: 1. High quality material: High quality alloy blades hardened tempered and carbon HSS steel construction make the blades more sharps and durable long-lasting. 2. Great performance: High Sharpness edge accurate positioning high hardness impacts resistance high precision smooth cutting high toughness.The Drill Bit can drill clean flat bottom holes with no chipping. 3. Perfect Design: Small incision resistance improve the opening speed; curve design is beneficial to chip removal. Perforation is more efficient. 4. Applicable Drill: It's suitable for handheld electric drill stand motor-drivens drilling machine and mobile ribbon type magnetism drilling machine. 5. Application: Perfectly used for the drawer mounting spherical door shoots tip; perforation on wood products plastic products etc. Cutting quickly precise holes in stainless steel mild steel iron copper brass and wood. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow slight deviation due to manual measurement. Specification: Material: High speed steel Use: Wood Drilling or Bubble Chamber Drilling. Total Length: 165mm. Size: 10mm 12mm 14mm 16mm 18mm 20mm optional includes: 1 x drill bit "