Irwin 5-Piece Left-Hand Mechanics Cobalt Drill Bit Set (30520)

The Irwin 5-Piece Left-Hand Mechanics Cobalt Drill Bit Set (30520) is a specialized tool engineered to handle one of the most common and frustrating problems in mechanical work: the removal of broken or stripped fasteners. Unlike traditional drill bits, this set features a unique left-handed design, meaning the flutes and cutting edges are made to rotate counterclockwise. This reverse rotation is crucial for extracting damaged bolts, screws, and studs, as it works to loosen the fastener from its hole rather than tightening it further.

KEY FEATURES AND BENEFITS:

• Left-Handed (Reverse Flute) Design: The bits rotate counterclockwise, which is essential for loosening and removing broken fasteners. As the bit drills into the damaged bolt or screw, its reverse motion can catch and unthread the fastener, often completing the extraction in a single step.
• M-42 8% Cobalt Steel Construction: This high-quality material provides superior heat and abrasion resistance, making the bits highly effective for drilling into hard metals like hardened steel, stainless steel, and cast iron without dulling prematurely.
• 135-degree Split Point Tip: This self-centering point allows for immediate drilling on contact, preventing the bit from wandering. It requires less feed pressure, which reduces the risk of work hardening and improves overall drilling efficiency.
• Included Pouch: The bits come in a durable pouch, ensuring they are kept organized and protected from damage when not in use.

SPECIFICATIONS:

• Model Number: 30520
• Set: 5-Piece
• Material: M-42 8% Cobalt High-Speed Steel (HSS)
• Bit Sizes: 5/64", 1/4", 19/64", 5/32", 7/64"
• Point Type: 135-degree Split Point
• Flute Type: Left-Handed, Heavy-Duty Spiral
• Included: 5 drill bits and 1 storage pouch

HOW TO USE:

1. Select the Correct Bit: Choose a left-hand drill bit that is slightly smaller than the broken fastener you need to extract.
2. Prepare the Drill: Secure the chosen bit in a power drill and set the drill to operate in reverse (counterclockwise) rotation.
3. Center the Bit: Carefully place the tip of the bit in the center of the broken fastener. A center punch can be used beforehand to create a small indentation for a more stable start.
4. Begin Drilling: Apply steady, light pressure to the drill and begin drilling at a slow speed. As the bit drills into the fastener, its reverse action may cause the fastener to loosen and unthread itself.
5. Remove the Fastener: Once the fastener begins to turn, continue drilling until it is fully removed. If the fastener does not turn, the hole you drilled can now be used with a screw extractor for removal.

BENEFITS OF USING IRWIN 5-PIECE LEFT-HAND MECHANICS COBALT DRILL BIT SET (30520):

• The main benefit of this set is its ability to remove broken fasteners without requiring a separate extraction tool in many cases. The reverse rotation can often catch the fastener and unscrew it on its own, saving you time and effort.
• The high-quality cobalt steel construction provides exceptional durability and heat resistance, allowing the bits to perform reliably on even the toughest materials without wearing out quickly.
• This set is a dependable, all-in-one solution for a common problem, simplifying a difficult task and preventing further damage to your workpiece.

FEATURES:

• Reverse flute design for counterclockwise rotation.
• Constructed from M-42 cobalt high-speed steel.
• 135-degree split point tip for quick, precise starts.
• Heavy-duty spiral flute for efficient chip ejection.
• Shorter cutting lips to minimize torque on hard materials.
• Designed for use in a reverse-rotation drill.
• Includes a durable storage pouch.
• Specifically engineered for the removal of broken fasteners.