Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. Titanium coated to reduce mit and heat Heat treated and highly polished. Drills perfectly round holes in steel, brass, plastic, wood etc. 3 sided shanks design in order to prevent slippage when in chuck Two flute design drives faster, smoother and cleaner cuts each step is clearly labeled with the depth diameter in steps Twist drill is high-speed steel after nitriding, with higher hardness. Use a twist drill to drill the hole before drilling can be more efficient. Material: Metal colour: black Package Contents: 1 x Drill Bit 3-12mm 1 x Drill Bit 4-12mm 1 x Drill Bit 4-20mm 1 x 3.0mm Nitride twist drill 1 x Bag(Note: Random color, don't accept the specified color.) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.