100% brand new and high quality Features: Automatically burrs holes as you drill. The two-flute design gives you a faster, smoother cut. Quick change of 1/4" hex shank. 4241 high speed steel for long life. These step drill bits are ideal for the variety of materials from metal, plastic, fiberglass to wood. They also help to enlarge the existing holes. 2 flute design tips made penetration faster without chipping. Step Cone Drills only, other accessories demo in the picture is not included. Specifications: Material: High Speed Steel Sizes: 3-12mm: 3.4.5.6.7.8.9.10.11.12mm (Length: 78.5mm) 4-12mm: 4.6.8.10.12mm (Length: 69mm) 4-20mm: 4.6.8.10.12.14.16.18.20mm (Length: 73mm) Shank Diameter: approx. 6.35mm (hexagon shank) Main Color: Golden Quantity: 3pcs/set Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Content: 1 x 3-12mm Step Drill Bit 1 x 4-12mm Step Drill Bit 1 x 4-20mm Step Drill Bit