DEWALT 7 In. 8,500 rpm 4.9 HP angle grinder. Dewalt’s perform and protect™ line of power tools is designed to provide a high level of one of more of the following: control, dust containment, or low vibration, without sacrificing performance. High power 4.9 HP (maximum motor HP) 8,500 rpm motor provides overload protection giving higher operating speeds under load. E-Clutch® System shuts the tool off when a wheel pinch is detected, reducing kick-back, a perform and protect™ control feature.