11 Amp 4-1/2″ Small Angle Grinder Trigger Grip, Lock-On. The 11 Amp 4-1/2″ Small Angle Grinder (Trigger Grip, Lock-On) delivers up to 3X more durability and up to 50% more power than the competition. With a 1,400 MWO motor that powers through the toughest jobs, the 6121-30 is the perfect match for industrial users. Milwaukee’s Electronic Advantage includes Overload Protection to maximize motor life, an Electronic Clutch that extends tool life and helps prevent bind-up, Line Lock-Out that prevents automatic start-up after power loss, and Soft Start. Featuring a 100% tool-free design, this Grinder allows the user to change all accessories, including hubbed product, without a wrench. In addition, the tool-free, burst resistant, adjustable guard allows users to make quick guard installations and adjustments.