IRWIN UNIBIT 2 Step Drill Bit, 6 Hole Sizes, 3/16 in to 1/2 in, 1/16 Step
$21.99
Step Drill Bit, High Speed Steel, Black Oxide, 3/16 in to 1/2 in Size Range, Hex, 1/4 in Shank Hex Size, 3 1/4 in Overall Length, Maximum Drilling Depth 5/16 in