Parts List: 9?ÁDrill Bit Product Specification: Product Name: Drill Bit Set Material: High Speed Steel Size: Diameter: 10 11 12 13 14 15 16 18 20mm Total length: 152mm Blade length: 76mm Handle diameter: 12.7mm (1/2inch) Notes: 1.Add water or coolant to cool down when drilling to prevent the drill bit from burning out. 2.There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 3.Please allow slight dimension difference due to manual measurement.