Three-position articulating frame adjustment for left angle, right angle or straight position grinding. Four-position dust shroud allows flush grinding against any vertical surface in the left angle, right angle or straight position. Multiple-position handle assembly allows the operator to work behind the unit for edge grinding or in front of the unit and control the amount of grinding pressure applied. Adjustable tubular handle construction provides operator maximum grinding flexibility and allows for complete clearance of any vertical surface. New & improved tapered roller bearings provide less maintenance and longer life.