Titanium Coated Step Drill Bit Set

Features:Set of 3 for jobs of all sizes.2 fluted edges for faster, smoother cutting.Hex shank prevents slippage when in the chuck.Surface treatment: Titanium Plating.Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.Material: HSS steel.The lengths are separately 86mm ( 6 steps), 72.5mm ( 9 steps), 77 ( 13 steps).The 3 cutters come in the following sizes:6 step: 3 / 16 inch , 1 / 4 inch , 5 / 16 inch , 3 / 8 inch , 7 / 16 inch , 1 / 2 inch .9 step: 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 step: 1 / 8 inch , 5 / 32 inch , 3 / 16 inch, 7 / 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