1. Can be applicable to iron, steel, copper, aluminum and other processing2. Each bit has a double end and grinding at a standard 60 degree Angle3. and , accurate positioning, cutting clear4. Quick cutting speed, and good chip removal5. For precise center drilling in metalsSpecification: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. and , accurate positioning, cutting 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 : as the picture Weight: 60gNo.Body diameterDrill tip diameter#14mm1mm#2 4mm 1.5mm#35mm2mm#4 6mm 2.5mm #58mm3mm#612mm5mmUsage: 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 drill, designed to prevent the drill from walking. 2. Used for work pieces with require machining between centers or producing center in components.Package Included: 6 x Center Drill BitsNote:Due to manual measurement, may exist 1-3mm error, please understand, thank you!