4PCS Punta da Trapano a Dente Seghettato Quad Edge,Punta da Trapano Seghettata ad Alta Resistenza 4 Flauti
4PCS Four-Edged Serrated Eccentric Drill. You can make your choice based on the available tools. The drills have a standard hexagonal shank, which is widely used and provides better grip. They are economical and practical.