Surface Dust Guards for Angle Grinders Dustless .
· Low speed grinders or polishers do not even need the rubber edging. It is only required when grinders exceed 4,000 Rpm. As a diamond cup wheel wears, the Rubber Seal Edging can be moved down to last beyond five cup wheels (the seal only touches the floor's high spots). Smooth Effortless Grinding ~ No noticeable friction is felt . . .