To use this Wera L - Key Set, first, identify the correct key size using the color - coding on the 'Take it easy' tool finder. Then, insert the key into the recessed TORX® screw. The holding function on the long arm of the key will keep the screw secure as you turn it. When you're done, use the clip fastener to store the keys neatly. For maintenance, keep the keys dry to prevent corrosion, and avoid using them on screws that are too large or hard for the key size, as this can damage the keys.