PRO GTB 650 Depth stop screwdrivers | A high motor RPM of 5,000 for faster screwing and hence quicker job completion, Attach with the Bosch screw auto feeder for an increase of productivity by at least 50%, Reversible Depth Gauge allows unscrewing without removing the gauge for convenience and safety, Use with drywall screws up to ?4mm in two layers of drywall and self-drilling screws up to ?6mm in 1.5 mm sheet metal