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Jobber length bits designed for drilling stainless and hard steel, plastic and wood, Premium Swift Bore (Registered Trademark) Hardened and tempered M2 high-speed steel bits fall between standard fractional drill sizes Precision ground, bright finish with polished flutes that increase chip ejection 135-degree split point for fast penetration and accurate starting with no center punch Letter Drill Size: F, Decimal Inches Equivalent: 0.2570, Tap Size: 5-16-Inch-18 NC, Overall Length: 4-1/8-inch