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Your screw should be long enough to penetrate completely through the wood and at least 1 inch (2.5 cm) into the concrete. Measure the depth of your wood and concrete objects, and purchase screws that will fasten the wood securely.  Although 1 inch (2.5 cm) of concrete penetration is the minimum, deeper penetration will result in a stronger hold. The longer your screws are, the tighter they will connect the wood and concrete. Concrete screws are the newest method of fastening wood to concrete and generally the most popular because they are easy to remove. The holes should be approximately the same diameter as the screws that you're using. Drill completely through the wood and about 1⁄4 inch (0.64 cm) deeper than the screw's length into the concrete.  Mark the holes in the concrete and wood using a permanent marker first to make sure your holes are precise. Blow the residual dust out of the concrete hole using a vacuum or syringe blower. Copper wire ensures that the concrete screws will fit tightly into the hole. Cut a piece of copper wire approximately the same length as the concrete and wood hole, and thread it through the holes before you drive the screw in. Use a drill or screwdriver to drive the screw completely through the wood and concrete holes. If you are driving multiple screws, use the first screw you drive in as a test screw to make sure the hole is deep enough and you've used enough wire.  You will know that you have used enough copper wire if the screw fits tightly into the hole and the connection between the wood and concrete is not loose or wobbly. Thread extra copper wire through the hole if it's too large for the screw.

Summary:
Select concrete screws based on the length of the intended hole. Predrill holes into the concrete and wood. Insert a piece of copper wire into the holes. Drive the screw through the wood and concrete.