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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