ITEM: Step Drill Bits; Tool Material: HighSpeed Steel ; Number Of Hole Sizes: 10 ; Shank Type: Hex ; Hole Diameter: 3/16 in; 1/4 in; 5/16 in; 3/8 in; 7/16 in; 1/2 in7/8 in,11/8 in,17/32 in,11/4 in,13/8 ; Series: HSTHOX ; Number Of Flats: 1 HERTEL. MANUFACTURER: HERTEL. BRAND: Hertel. MANUFACTURER PART: SD6560858. CATEGORIES: Maintenance, Repair and Operational (MRO) Supplies. Drilling & Drill Bits. Metalworking & Multipurpose Drill Bits. Step Drill Bits & Subland Step Drill Bits. KEYWORDS: HertelDrilling & Drill BitsMetalworking & Multipurpose Drill BitsStep Drill Bits & Subland Step Drill BitsStep Drill Bits.