The old way to refurbish the screen and back glass is to replace the front glass and back glass, which is not only difficult and costly but also less efficient. For the front and back glass with smaller scratches, the grinding and polishing machine only needs 3-6 minutes to complete refurbishment while bigger scratches require 8-12 minutes, which shows great power in refurbishment. The emergence of the polishing and grinding machine can greatly improve the efficiency of phone refurbishment and reduce the refurbishment cost effectively..syi