Stroton Metric M42 8% Cobalt Twist Drill Bits Set. See It . What We Like. Includes 19 drill bits in ½-millimeter increments; M42 alloy bits stay sharp for longer; Stepped split points can be ...

Industrial-duty versions of twist drill bits are made from various forms of high-speed steel (such as a cobalt-molybdenum alloy, M42), and these bits may also have a wear-resistant nitride (or ...

The bits range in diameter from 1/16-inch to 1/2-inch and feature durable M42 cobalt construction for superior performance and longevity. Never Have to Chuck Up a Bit Ever Again!