To use these DAGGER-CON concrete screws, first make sure the surface is clean and dry. Drill a hole that matches the size of the screw. Insert the screw into the hole and use a 5/16' hex driver to turn it in. When using in wood or thin gauge metal, the hi-low threads will work great. Just be careful not to over - tighten the screw as it might damage the material. For maintenance, keep them in a dry place to prevent the yellow zinc finish from corroding. If you notice any rust spots, you can gently clean them with a soft cloth. Always refer to the safety guidelines during the installation process.