ITEM: 8 Hole Sizes, 9/16 to 1 Hole Diam High Speed Steel Standard Point Step Drill Bit IRWIN. MANUFACTURER: IRWIN. BRAND: Irwin. MANUFACTURER PART: 10220. 8 Hole Sizes, 9/16 to 1 Hole Diam High Speed Steel Standard Point Step Drill Bit 1/8 Step Length, 7/16 Round Shank with Flats, Bright Finish (MOQ1, Pkg Qty1)CATEGORIES: Maintenance, Repair and Operational (MRO) Supplies. Drilling & Drill Bits. Metalworking & Multipurpose Drill Bits. Step Drill Bits & Subland Step Drill Bits. TOTAL RECYCLED CONTENT: 10.00%. POSTCONSUMER RECYCLED CONTENT: 1.00%. KEYWORDS: IrwinDrilling & Drill BitsMetalworking & Multipurpose Drill BitsStep Drill Bits & Subland Step Drill BitsStep Drill Bits.