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Product Description This IRWIN Unibit #3 Cobalt Step Drill Bit is engineered with M-35-grade cobalt steel for maximum life when drilling in tough steel. The SpeedPoint tip provides fast starts and features laser-marked sizes for easy reading. The radial concave flute design helps ensure an effective use of drilling power. From the Manufacturer Irwin Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Irwin Industrial Tools 10233CB 3 9 Hole Sizes (1/4-Inch-3/4-Inch), 1/16-Inch Increments