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bosch step drill, Bosch Tool Corporation Titanium Coated Step Drill Bits, 3/16 in - 1/2 in, 6 Steps, 1/EA | Fasteners, Bosch - Step Drill Bit: 1/4 to 7/8" 3/8" Shank Dia, High Speed Steel, 3 Hole Sizes - 73850398 - MSC Industrial Supply