Specifications:Well made of premium high speed steel, which is abrasion resistant and durable, and coated with titanium for three times of prolonged life.Can drill the screw hole and the counterbore that accommodates the screw cap at the same time and keep the two on the same line.After screwing the screw, the screw cap is below the plane of the board.Suitable for drilling machines with collets or joints, suitable for drilling holes in hard wood and wood.Type: Twist Drill BitMaterial: High Speed SteelOuter Blade Tip Angle: 138 DegreeFeatures: Wide Use, Durable, Abrasion ResistantBlade Diameter: 5mm - 12mm/0.2" - 0.47" (Approx.)Blade Length: 20mm/0.79" (Approx.)Full Length: 70mm/2.76" (Approx.)Shank Diameter: 6.35mm (1/4")(Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:5 x Twist Drill Bit1 x Wrench Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store