Getting the center out of a circle scored in glass has never been easy, but this CRL Freez-It Spray Propellant makes this tough job easier. It is used to run a scored circle without any tapping required. Doing it this way, the run will have no flares. It works on a basic scientific principles that cold objects contract. When the center contracts it creates a true run around the circle. Small circles can be sprayed in the middle, larger circles sprayed 1" (25 mm) inside score line. As it runs, follow it with the Freeze-It Spray propellant until the run is complete. Propellant is environmentally and ozone safe.