["brand new and high quality\nFeatures:\nAutomatically burrs holes as you drill.\nThe two-flute design gives you a faster, smoother cut.\nQuick change of 1/4\" hex shank.\n4241 high speed steel for long life.\nThese step drill bits are for ideal for the variety of materials from metal, plastic, fiberglass to wood.\nThey also help to enlarge the existing holes.\n2 flute design tips made penetration faster without chipping.\nStep Cone Drills only, other accessories demo in the picture is not included.\n\nSpecifications:\nMaterial: High Speed Steel\nSizes:\n3-12mm: 3.4.5.6.7.8.9.10.11.12mm (Length: 78.5mm)\n4-12mm: 4.6.8.10.12mm (Length: 69mm)\n4-20mm: 4.6.8.10.12.14.16.18.20mm (Length: 73mm)\nShank Diameter: approx. 6.35mm (hexagon shank)\nMain Color: Golden\nQuantity: 3pcs/set\n\nNote:\nNo retail package.\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Content: \n1 x 3-12mm Step Drill Bit\n1 x 4-12mm Step Drill Bit\n1 x 4-20mm Step Drill Bit"]