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1/4 Inch x 8 Inch Drill Bit – Long Drill Bit, Industrial Black Oxide Coating – Cobalt Aircraft Extension Drill Bits for Steel, Hard Metal, Cast Iron, Wood, Plastic 1/4 x 8 Inch

Quick facts

  • Brand: ‎YOKOCUT
  • Price: USD 5.68
  • Rating: 3.90 (8 reviews)

If you need extra reach without stepping up to specialty tooling, the YOKOCUT 1/4″ x 8″ long drill bit is designed for accessing hard-to-reach drilling locations while keeping the size you’re used to. It features a precise 1/4-inch cutting diameter and an 8-inch overall length for targeted drilling tasks where standard-length bits can’t fit.

This aircraft extension-style bit is made from cobalt steel and finished with a black oxide coating to improve lubricity and help hold coolant near the cutting edge. A 135° split point construction is intended to promote efficient starts, while the right-hand, spiral-fluted design helps lift chips up and away to reduce clogging during drilling.

It’s a versatile pick for jobs involving steel, hard metal, cast iron, aluminum, stainless steel, as well as wood and plastic—ideal for DIY repairs, shop work, and metalworking tasks that demand reach.

  • 1/4″ cutting diameter with 8″ overall length for long-reach drilling
  • Cobalt steel construction with black oxide finish for improved lubricity
  • 135° split point design for efficient starts
  • Spiral, right-hand flutes to help clear chips during drilling
  • Suitable for steel, hard metal, cast iron, aluminum, stainless steel, wood, and plastic