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For maximum control and perfect finish use a high quality cordless impact driver, stopping the screw head flush with the decking board. The use of the 4.5mm diameter drill bit supplied with every box of 200 screws is recommended to achieve the best looking and trouble free finish. Without pre-drilling, the chance of damaging the coating of the screw becomes greater and depth control is reduced. If using a combi-drill and a suitable torque setting can’t be established then take care not to drive the screw too far below the surface of the board when in drill mode (it is wise to stop short of the surface of the board and manually twist the chuck of the drill to achieve optimum screw depth).