MIBRO Magnetic Auto-Clutch Drywall Screw Setters are a handy and invaluable accessory for properly driving drywall screws into drywall, particle board, and plywood. The unit is pre-set to countersink screws to the perfect depth in drywall and the automatic clutch release eliminates drywall tear-out. The device is reversible with a quick push-in, turn-to-lock feature for screw removal. Simply remove the worn Drywall insert bit when it is worn down. Device includes one insert bit pre-installed and two additional replMIBROment bits. *