The Milwaukee 22-09-1820 Angle Grinder PCB Assembly supports reliable electronic control in compatible cordless angle grinders. The printed circuit board helps manage power delivery, motor operation, speed, torque, and safety functions during tool use. This replacement assembly is designed to replace a damaged or faulty circuit board during power tool maintenance or repair. Proper ins... https://www.wholetoolbox.com/milwaukee-22-09-1820-angle-grinder-pcb-assembly/22-09-1820.html