With the Spax Drill 2 Step stepped drill bit, you build wooden decking with a clean finish while preventing timber from splitting. This tool combines two operations in a single pass: it drills a 4.1 mm pilot hole and simultaneously creates a 6.5 mm counterbore. It is designed for Spax cylinder head decking screws with 5.0 mm and 6.0 mm diameters. You eliminate the need to switch between standard drills and countersinks, saving time on every board. Individually packaged in a durable tin container, the bit remains fully protected from damage inside your toolbox.