The concrete screw cuts its own thread in the drilled hole in a concrete wall. This system is very strong when used in concrete and concrete block walls. The drill bit required is a 5/32" concrete drill bit.
Drill hole in wall a little deeper than length of the concrete screw provided with special 5/32" concrete drill bit. Do not substitute any other drill bit. Attach hook to wall with concrete screw and countersink washer provided.