The Ryobi Elect. Tools 89240020009 Soft Start helps provide controlled motor startup for compatible power tools. The component manages the initial electrical power supplied to the motor, allowing it to start more gradually when the tool is switched on. This replacement part is designed to replace a worn or damaged soft-start component during power tool maintenance or repair. Proper in... https://www.wholetoolbox.com/ryobi-elect-tools-89240020009-soft-start/89240020009.html