Hymnorq Jobber Twist Drill Bits 15pc Set, Fractionsh Inch Size 1/16 to 3/8 in Premium Index Case, M35 Cobalt Steel, 135 Degree Split Point, for Stainless Steel Iron and Other Metals -

M35 5% Cobalt Steel Twist Drill Bits Set M35 Grade Cobalt Steel Cobalt drill bits are not made of pure cobalt, but rather a steel alloy with certain percent cobalt.

The 5-percent alloy is known as M35 grade.

The cobalt increases the strength of the steel and makes it more heat-resistant.

Lowest Cost Per Hole Drilled Cobalt bits are more expensive than ordinary HSS drill bits.

But if you regularly drill metals, they are a good investment since they tend to last longer.

With an extended life, you can lower the cost per hole drilled.

15PC Fractional Inch Drill Bits: 1/16"(2pcs), 3/32"(2pcs), 1/8"(2pcs), 5/64", 7/64", 9/64", 5/32", 3/16", 7/32", 14", 5/16" and 3/8"