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