Description: This is the New HSS Steel Large Step Cone Drill Titanium Bit Set Hole Cutter,which is made from high quality HSS steel, and with the Titanium coated to reduce friction and heat. Save time because you don't need to change drills for different-sized round holes in thin materials. Each drill acts as a pilot for the next size. Non-skid tip, no need for center punches. Hex shank prevents drill chuck slipping. Drill diameters etched in flute for easy identification. It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. Easy to use and durable. Specification: 3-12mm 10 Steps ,Length: 78.5mm / 3inch 4-12mm 5 Steps, Length: 68mm / 2.67inch 4-20mm 9 Steps, Length: 74mm / 2.91inch Package Includes: 3 Pieces Step Drill Bit Set Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!