Remove your lights from their places in the ground. Use the drill to make small holes in the base of each light.
Tie the plastic-coated steel wire to the hole you drilled in the first solar light and string it through the rest of the holes. Once you reach the end of the lights, secure the wire to the stake and use the hammer to drive it in to the ground so it cannot be seen.
Use the shovel to dig a small trench between lights to hide the plastic coated steel wire. String the wire through the trench and push all the lights into the ground. Spread dirt or rocks over the trench and around the lights to make sure the wire is completely covered and the lights are secured into the ground.
Use the shovel to dig small holes deep enough for the solar lights to sit securely in position.
Follow the instructions on the concrete mix for adding the correct amount of water. Pour the mixed concrete into the holes where the solar lights will be placed.
Push the bases of the solar lights down into the holes filled with concrete. Make sure they are in a centered and even position that looks neat. Once dry, cover the concrete bases surrounding the lights with dirt or rocks for a more presentable look.