Details:* & * 10/15/20/25/30/35/40/45mm HSS Steel Tapered Step Drill Bit Titanium Drill Hole Opener* Used for materials with hardness of 25 or less and thickness less than 5mm, such as carbon steel, thin iron, insulation board, pvc board, wood board, etc.* Made of HSS steel, and practical Specification:* Name: 10-45MM Twist Drill Bit Step Drill Bit Surface Nitriding Straight Groove Titanium Drill Bit gradual multifunctional* Color: Gold(as pictures show)* Size: 100*12cm (Approx.) * Type: 10-45mm (10.15, 20.25, 30.35, 40.45mm)* Material: HSS4241 high speed steelPackage Contents:1 * Drill Step Note:The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.