Function - Center drills and point drills are traditionally used to create tapered holes for lathe centers and starting points for standard twist drills and are designed to prevent the bit from walking. DESIGN - Each bit is double ended and comes with a standard 60 degree angle. FIT - Central support for the production of components or parts requiring center to center machining. Material-Material: HSS, applicable hardness: less than HRC40. Sizes - Set includes 5 sizes: 1.5mm tip diameter, 5mm barrel diameter and 35mm length, 2.0mm tip diameter, 5mm barrel diameter mm and length of 35 mm. 41mm and 2.5mm tip diameter, 6mm body diameter and 45mm length and 3mm tip diameter, with 8mm body diameter, 51mm length, 4mm tip diameter , body diameter 10 mm, length 60 mm. Features: These center drill bits are used in metalworking to provide a starting hole for larger drill bits. They can also be used to make taper indentations in the end of parts to accommodate lathe centers. The center drill bit is made of high speed steel with high hardness and good wear resistance. The set includes 5 center drills that can be used to drill holes of different sizes. Widely used on lathes, these center bits can cut easily and remove chips smoothly. Pilot drills and point drills are traditionally used to create a tapered hole in the center of a lathe, providing a starting point for a standard twist drill, Designed to prevent the drill from running. Center supports for the production of components or parts requiring center-to-center machining. Note When using these bits, the temperature of the material (such as mild metal, mild steel, aluminum, acrylic plastic and wood, etc.) will be very high, please add water or coolant to prevent the product from smoking during use.