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Product Description This IRWIN Unibit Cobalt Step Drill Bit Set is engineered with M-35-grade cobalt steel for maximum life when drilling in tough steel. The SpeedPoint tip design 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's Unibit SpeedPoint combines the most desired features of a Step Drill, speed and control and as many as 13 different sizes onto one single-fluted step drill bit. Irwin Industrial Tools 10502CB 502 Set (10231, 10232, 10233), 3-Piece