Makita’s 4-1/2” SJS™ Angle Grinder combines 13 AMP variable speed power with comfort and motor-protection features for longer-lasting stone grinding and polishing performance. The 9564CV is engineered with Makita’s innovative SJS™ mechanical clutch system to protect the gears for longer tool life. 13 AMP Power with SJS™ mechanical clutch system to Protect Gears. POWER : 13 AMP motor delivers 2,800 - 10,500 RPM PERFORMANCE : SJS™ technology is a mechanical clutch system that helps prevent motor and gear damage VERSATILITY : Variable speed control dial enables user to match the speed to the application DURABILITY : Soft start suppresses start-up reaction for smooth start-ups and longer gear life INCLUDES : Grinding wheel, wheel guard, side handle, inner flange, lock-nut, and wrench  Features Powerful 13 AMP motor delivers more output and variable (2,800 - 10,500) RPM SJS™ technology is a mechanical clutch system that helps prevent motor and gear damage by allowi...