Features: These center drills are used in metalworking to create a starting hole for a larger drill bit. They can also be used to create a tapered recess at the end of a workpiece for mounting a lathe center. These center drills are made of high-speed steel, have high hardness and good wear resistance. This set includes 5 center drills that can be used to drill holes of various sizes. These center drills are commonly used on lathes and can easily cut and remove chips smoothly. Usage: Center drills are traditionally used to create a tapered hole for a lathe center to provide a starting point for a standard twist drill. Designed to prevent the drill from moving. Used to produce center supports in components or workpieces that require machining between holes. Note: When using these drills... The temperature of the material (e.g., soft metal, carbon steel, aluminum, acrylic plastic, and wood, etc.) will be very high. Add water or coolant to prevent the product from smoking during use.