The Coolview Disc, from JOOL Tool, provides the angle grinder with more precision and control by allowing users to see through the spinning disc to watch the actual progress of the work as it is happening. A series of curved and straight slots are formed into the disc, extending all the way to the disc edge to provide a clear, glare-free view of the primary area where most work is done. The backside of the Coolview disc is fitted with a series of fins producing a steady flow of air that keeps the work surface up to 50 percent cooler.