Coated by titanium, this step drill set performs well in heat, corrosion and rust resistance,Can reduce friction and run cooler.Flute design provides faster, smoother and cleaner cutting.Suitable for cutting holes in various materials, including steel, brass, wood, plastic, etc.Center punch accurate locator, non-slip and crooked.6 steps: 3/16 inch to 1/2 inch, (3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch)9 steps: 1/4 inch to 3/4 inch, (1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch)10 steps: 1/4 inch to 1-3/8 inch, (1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1 -1/8 inch, 1-1/4 inch, 1-3/8 inch)12 steps: 3/16 inch to 7/8 inch, (3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch, 13/16 inch, 7/8 inch)13 steps: 1/8 inch to 1/2 inch, (1/8 inch, 15/32 inch, 7/16 inch, 15/32 inch, 1/4 inch, 9/32 inch, 5/16 inch, 11 / 32 inch, 3/8 inch, 13/32 inch, 7/16 inch, 15/32 inch, 1/2 inch)Colour: GoldMaterial: MetalPackage Contents:5 * Step drill1 * Center punchOnly 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.