Irwin cobalt alloy steel drill bits are built for tough metal. The 8 percent cobalt high-speed steel resists the heat and abrasion that ruin ordinary bits, and the 135-degree split point starts drilling immediately with less force instead of walking across the work surface.

• 8 percent cobalt alloy high-speed steel for heat and abrasion resistance
• 135-degree split point starts on contact and minimizes bit walk
• Heavy-duty web construction for added strength and durability
• Straight shank, standard jobber length
• For tough metal drilling, including heavy-duty abrasive alloy metal and hardened steel
• Size: 7/16" diameter x 5-1/2" overall length
• Irwin catalog number 3016128, one bit per card

Tip: Drill hard metals at low speed with cutting oil and steady, moderate pressure. Too much speed is what burns a cobalt bit; too much pressure is what breaks it.