Irwin Tools 31520 5/16-Inch Cobalt Alloy Steel 135-Degree, Left Handed-Mechanics Length, Pack of 6

This IRWIN Left-Hand Cobalt HSS Fractional Mechanics-Length Drill Bit is made from 8% cobalt-alloyed steel for higher heat- and abrasion-resistance. A shorter length provides additional strength. The drill bit is useful for drilling into fasteners without tightening them and can often remove broken fasteners without the use of an extractor.

• This drill bit features 8% cobalt-alloyed steel construction for high heat- and abrasion-resistance
• Shorter drill bit length provides additional strength
• Drill bits have a heavy-duty spiral flute design that produces faster chip ejection
• Shorter cutting lips reduce torque for drilling in high-tensile-strength materials
• 135° split point reduces feed pressure for easier penetration without work-material hardening
• This drill bit features 8% cobalt-alloyed steel construction for high heat- and abrasion-resistance
• Shorter drill bit length provides additional strength
• Drill bits have a heavy-duty spiral flute design that produces faster chip ejection
• Shorter cutting lips reduce torque for drilling in high-tensile-strength materials
• 135° split point reduces feed pressure for easier penetration without work-material hardening