New Old Stock IRWIN UNIBIT USA made Step Drill Bit, 1/8-Inch to 1/2-Inch , 1/4-Inch Shank (10231)
Single-flute cutting edge for greater control through steps, Hex shank prevents slipping in drill chuck, SpeedPoint tip penetrates fast and prevents walking, Ideal for drilling holes into thin materials like stainless steel, copper, brass, aluminum, plastic, Self Starting - 1/8" Maximum Material Thickness
Date on the packaging has manufacturing dates between 2007-2017. There are two styles of packaging as shown in the photos depending on the date of manufacture.
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