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Greycore Tools 1/8 Inch x 6 Inch Cobalt Aircraft Extension Bit – 2 Pack M35 Cobalt Drill Bit, Industrial Titanium Coating – Drill Bits for Steel, Hard Metal, Cast Iron, Wood, Plastic (1/8″ x 6″) 1/8″ x 6″ 6″ Length
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What people love (and don’t love)
What people love
High-quality cobalt drill bits that cut well and stay sharp.
Useful length for drilling deep holes and hard-to-reach places.
Durable with good tensile strength, resistant to breaking.
Reusable, sturdy plastic case included for storage.
Well-priced and reliable for various materials including steel, hard metal, and PVC.
What people don’t love
Some customers received used or damaged items with wear marks.
Minor concerns about wear on the shank end due to drill chuck slippage.
Limited size options, which may not fit all needs.
Reliable and sharp cobalt drill bits in a practical size, mostly praised for quality and performance despite occasional concerns about packaging and condition.
When you need extra reach without stepping up to a larger diameter, the Greycore Tools 1/8″ x 6″ Cobalt Aircraft Extension Bit set is a practical, workshop-ready choice. This 2-pack is made from M35 cobalt high speed steel (5% cobalt) with an industrial-strength titanium coating, helping the bits stand up to heat and abrasion during demanding drilling tasks.
You can view the current price and full details on Amazon here.
Each bit features a 135° split point tip designed to reduce slipping and support faster, smoother drilling starts—especially helpful when working on harder materials or when accuracy matters in tight spaces.
2-pack of 1/8″ x 6″ long cobalt drill bits for extended reach
M35 cobalt high speed steel (5% cobalt) for durability in demanding drilling
Titanium finish for added resistance to abrasion and high heat
135° split point tip helps prevent walking and supports smoother starts
Works on hard metals, stainless steel, cast iron, steel, titanium alloy, hard plastics, and wood
With a straight shank and spiral flute design, these long-length bits fit a wide range of common drilling setups and are well suited for repair, construction, and woodworking applications.
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