21/64 Nitro Heavy Duty Jobber Drill Bits 6 pack 1/2-13 x 4 1/2 Solar Panel Installation

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21/64 Nitro Heavy Duty Jobber Drill Bits 6 pack 1/2-13 x 4 1/2 Solar Panel InstallationNeed a large quantity? Request bulk pricing here. 21 64 Nitro Heavy Duty Jobber Drills Pack of 6 Manufactured from a premium grade of M 7N molybdenum high speed steel. The Nitro Heavy Duty 135 degree Split Point drill with a Nitride surface treatment that give a hard protective layer to the drill (increases hardness without increasing brittleness) which is measurably harder than high speed steel. Body and clearance are gold and black surface treated