IRWIN Step Drill Bit, 3/16-Inch to 7/8-Inch, 3/8-Inch Shank (10234)

Irwin Tools IRWIN Step Drill Bit, 3/16-Inch to 7/8-Inch, 3/8-Inch Shank (10234)

Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic

Jerax tools 3/16-7/8 Inch Step Drill Bit, M2 HSS Spiral Grooved Step Bit for Stainless Steel, Metal, Wood, Plastic