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HYCLAT 5PCS Step Drill Bit Set | Titanium High-Speed Steel (HSS) Stepper Cone Drill Bit | Covering 50 Sizes(1/8''-1 3/8''), 135 Degree Point, with Aluminum Case - Amazon.com
Milwaukee 48-89-9289 Milwaukee Cobalt Step Drill Bit #9 (7/8"-1-1/8")