Features Each drill bit has a double end and grinding at a standard 60 degree angle. For precise center drilling in metals. During rotation between the tips, the two end faces of the workpiece receive the corresponding centering bore. Can be applicable to iron, steel, copper, aluminum and other processing. Preparation tool to maintain exact drilling position. Fast cutting speeds and good chip evacuation. Sharp and durable, precise positioning, clear sharpness. Features: Quantity: 6 pieces Product specification: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 5mm Specific dimensions: as shown in the picture. Weight: 60 g No. Body Diameter Drill Bit Tip Diameter #1 4 mm 1 mm. #24 mm. 1.5 mm #3 5 mm. 2 mm. #46 mm 2.5 mm #5 8 mm 3 mm. #6 12 mm 5 mm. Use: 1. Central and locator drill bits are traditionally used to make a tapered hole for a center of lathe to make a starting point for a standard twist drill, designed to prevent the twist drill from walking. 2. Used for parts requiring machining between centers or a production center in components. Package includes: 6 x Center Drill Bits Note: Due to manual measurement, there may be an error of 1-3 mm, please understand, thank you! Package List