No need for:
The CORK Core Hole Repair Kit is the fastest way to form and repair slab and wall penetrations. Made of non-combustible steel adn aluminum, holes between 2" and 12.5" can be repaired in less than 2 minutes.
A major advantage of this system over traditional repair methods is the ability to complete the repair from one location - no need to work from both above and below the hole. Savings accrue as a result of less time required and less risk for workers.