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.

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 10231CB 1 13 Hole Sizes (1/8-Inch-1/2-Inch), 1/32-Inch Increments

About this item

• Drill bit is engineered with M-35-grade Cobalt Alloy Steel 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
• Drill bit is engineered with M-35-grade cobalt 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