• (1) 1/8″ to 1/2″ Step Drill Bit
• Drill bit is engineered with M-35-grade Cobalt Alloy Steel for maximum life when drilling in tough steel
• Drill bits feature a radial concave flute
• IRWIN drill bits have laser-marked sizes for simple identification
• Drills 13 hole sizes from 1/8 inch to 1/2 inch in 1/32-inch increments
This IRWIN Unibit #1 Cobalt Alloy Steel Step Drill Bit is engineered with M-35-grade Cobalt Alloy Steel steel for maximum life when drilling in tough steel. Laser-marked sizes enable easy reading. The radial concave flute design helps ensure an effective use of drilling power.
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