Makita 9557PB 4-1/2in Angle Grinder with AC/DC SwitchDescription. Powerful 7.5 AMP motor delivers 11,000 RPM for high output power. Compact design with small 2-1/2 diameter barrel and weighs only 4.5 lbs. For added comfort. Labyrinth construction seals and protects the drive gear and bearings from contamination for longer tool life. Lock-on/off feature for continuous operation. AC/DC switch for use with alternative power source. Protective zig-zig varnish seals the armature from dust and debris for longer tool life. Extra-large paddle switch for comfortable operation. Thicker coil wires are wound more closely to reduce heat and energy loss. All-ball bearing design and metal gear housing for durability. Push button.