The X-Change module (X-CM) core bits by Hilti can be re-tipped on the job site in just a few minutes using a screwdriver, allowing operators to replace a worn X-CM module with a new module instead of replacing the entire core bit in the event a bit becomes stuck in concrete. All modules are easier to store and transport than complete drill bits, and are available in diameters ranging from 2 to 8 inches. 800/879-8000; www.us.hilti.com.