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Brand Name: Irwin *Sub Brand: Cobalt *Diameter: 21/64 in. *Overall Length: 4-5/8 in. *Material: High Speed Steel *Product Type: Drill Bit *Shank Type: Straight Shank *Number in Package: 1 pc. *Usage: For Tough Metal Drilling Including Heavy-Duty Abra *Packaging Type: Carded *For Hardened Steel *Discovery ACC, SUP