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The EAGLE CUTTING TOOL A712-016-I is a high-speed steel (HSS) aircraft-extension drill bit designed for deep-reach drilling in tight or elongated access situations. With a 1/4-inch diameter and a 12-inch overall length (OAL), this bit is built for applications where standard-length drills cannot reach. The 135-degree split-point tip reduces walking on contact, allowing cleaner starts without a center punch on most materials. It is suited for use by maintenance technicians, aircraft mechanics, electricians, and general trade professionals who need extended reach in steel, aluminum, and similar materials.
Aircraft-extension drill bits like the A712-016-I are commonly used in structural steel work, aircraft maintenance, HVAC ductwork fabrication, electrical rough-in, and any application requiring drilling through deep assemblies or bulkheads. The extended 12-inch OAL gives the bit the reach needed to drill through wall cavities, framing members, or layered sheet metal where a standard jobber-length bit falls short. This bit is appropriate for use in hand drills, drill presses, and right-angle drill attachments.
Designed as an OEM-style extended-reach drill bit for use in standard 3-jaw drill chucks and drill presses that accept 1/4-inch shank tooling.
Secure the bit firmly in the chuck before operation and verify shank seating to prevent slipping under load. Use appropriate cutting fluid or lubricant when drilling through steel to extend bit life and improve cut quality. Always wear eye protection and secure the workpiece before drilling. Inspect the bit for cracks or wear before each use and replace if the cutting edges show signs of damage or dulling.
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