CoreTech Concrete Cutting & Drilling Services is your leading Concrete Cutting Contractor. When you choose CoreTech you are partnering with a company that has been delivering competitive prices and on-time job completion for 10 years. Honesty, Excellence and Performance are at the core of everything we do. We would be happy to do business with you. Concrete core drilling is the process of removing a cylinder of material (a core) with the use of a specialized concrete drill. CoreTech has the ability to core drill a wide range of sizes and depths - from half an inch to 14 inch in diameter.