585-10239CB Features: -6X longer life. -3-Flatted shank. -SpeedpointTM tip. -Laser marked sizes. Number Of Bits: -1. Unit Material: -Cobalt. Use: -Drill Bits. Dimensions: Overall Product Weight: -2.06 Pounds.
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 10239CB 9 2 Hole Sizes (7/8-Inch and 1-1/8-Inch )for 1/2-Inch and 3/4-Inch KO