professional countersink, carbide-tipped, drilling and countersinking in one operation by directly attaching to the wood twist drill, suitable for all types of wood, coated panels, many plastics and also exotic decking wood, for countersinking screw heads with simultaneous drilling, when the VARIO is screwed on, the following dimensions result (ø drill countersink): 310.5 411.5 512.5 613.5 814.5