A useful accessory that converts a drill driver into a depth sensitive, fully adjustable screwdriver, as it will insert the screw to a pre-set depth regardless of material hardness. Also suitable for drywall screws. A magnetic ring secures the screw onto the bit. As soon as the outer ring touches the work surface it retracts, which leaves the screw head visible. This gives you accurate depth control for consistent and neat countersinking. The universal shank is compatible with all makes of tools including Festool's Centrotec.