Smooth Cutting Inserts: Tungsten carbide cutting tip with special heat treatment for sharp cutting edge, high hardness, no burrs and durable use. Arc curve design head for easy chip removal, more efficient punching. 3 Different Drill Bit Set: Drill straight, inclined holes and overlapping, size: 16mm, 22mm, 35mm Round drill bit set andlt or pandgt X-Wing Design for Precision: X-wing head provides visibility and stability during operation. The center spur of each drill bit ensures precise drilling and prevents walking and wobbling during operation, creates perfectly round and precise holes thanks to the center spur design. Application: Perfect for drilling precision holes in all different types of wood, such as drawer, spherical door tip mounting, etc. Professional Tool Sets: Two spurs and one center spur for repeated, clean and precise cutting of holes for woodworking, furniture, door hinge holes