5/16"x6" Cobalt Aircraft Extension Drill 2141220 Dayco designed to replace original

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Valve rocker cover

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5/16"x6" Cobalt Aircraft Extension Drill 2141220 Dayco designed to replace originalNational Aerospace Standard 907, Type J Cobalt Drills, 6" OAL with Jobber Drill Flute Length, Cobalt Extension Drill, Cobalt HSS, Surface Treated, 135 Split Point These cobalt jobbers length drills are used for drilling in tough, high tensile strength materials like stainless steels, titanium and inconel. They are made of cobalt high speed steel, with heavy duty flute construction and 135 split point.