Features Can be applicable to iron, steel, copper, aluminum and other processing Each bit has a double end and grinding at a standard 60 degree Angle Sharp and durable, accurate positioning, cutting edge clear Quick cutting speed, and good chip removal For precise center drilling in metals Features: Can be applicable to iron, steel, copper, aluminum and other processing. Each bit has a double end and grinding at a standard 60 degree Angle. Sharp and durable, accurate positioning, cutting edge clear. Quick cutting speed, and good chip removal. For precise center drilling in metals. When rotating between the tips, the two end faces of the workpiece receive the corresponding centering bore. Preparation tool to maintain the exact drilling position. Specifications: Quantity: 6 PCS Product specification: 1.0mm, 1.5mm,  2mm, 2.5mm, 3mm, 5mm Specific dimensions: as the picture Weight: 60g No. Body diameter Drill tip diameter #1 4mm 1mm #24mm1.5mm #3 5mm 2mm #46mm2.5mm#5 8mm 3mm #6 12mm 5mm Usage: 1. Center and spotting drills are traditionally used to make a conical hole for a lathe center in order to make a starting point for a standard twist drill,designed to prevent the twist drill from walking.2. Used for work pieces with require machining between centers or producing center  in components. Package Included: 6 x Center Drill Bits Note: Due to manual measurement, may exist 1-3mm error, please understand, thank you! Package List