Drill bits cobalt pro grade. Cobalt drills are designed to cut through extremely hard metals, including stainless steel. No center punch needed: century 135 degree quick-cut points are self-centering and penetrate faster with less pressure, will not walk or wander at the starting surface. Extremely heat resistant, must be used and operated in power units that have a rpm speed of 1.500 or more for maximum efficiency. Aerospace nas 907-j specifications. 14x life rating, comparison to the average 118 degree point high speed steel drill. 8% cobalt.

Product Features:

• Cobalt drill bit. Designed to drill extremely hard metals including stainless steel.
• Designed for drilling in extremely hard materials including stainless steel
• Cobalt drill bits have a great resistance to heat and friction providing a longer tool life
• 135 degree quick cut points are self-centering and penetrate faster with less pressure will not walk or wander
• Cobalt drill bits offer 14 times Life Rating when compared to standard 135 Degree point drill bits
• 29pc Set Includes 1/16" to 1/2" by 64ths drills