The Macsim 10g x 50mm Clever Tool is an all-in-one pre-drilling and countersinking tool designed for 10G standard head screws. It ensures consistent drill depths, prevents timber splitting, and is ideal for decking and woodworking projects. Combines the pilot hole drill bit, countersink cutter, and a depth-stop collar in a single unit. The Clever Tool is not suitable for use with impact drivers. Includes 2 replacement drill bits and a hex key, allowing you to swap out worn bits easily.