[Specification 2] ●Gypsum board thickness: Up to 12.5mm ●Compatible gypsum board: Gypsum board GB-R ●Use a rechargeable screwdriver with torque adjustment or a hand-cranked screwdriver ●Attached screw diameter (mm): 4 ●Used screws: Tapping Screw M4, small screw M4 (total length: thickness of attached object + 20 mm or more)