PLATINUMEDGE Step Drill Bits Set, 5 Pieces SAE, High Speed Steel Step Bits with 50 Total Step Sizes, Double Flute Cutting Blades, Nitride Black Coating and Polished
ENBMEI M35 Cobalt Step Drill Bit Four Spiral Flute, 3/16"-1-3/8" (19 Step Sizes) - Ideal for Metal, Stainless Steel, Wood, Plastic - 1/4" Hex Shank