Dewalt dwp849x is a 150mm and 180mm variable speed polisher with rubber overmoulded gear casing and variable speed trigger allowing the operator to control the speed of the unit by adjusting the force applied to the switch replaceable wool ingestion shields prevent wool from being sucked into the unit and blocking the tool an additional safety feature is a no volt release switch which will prevent the unit from starting when plugged in even if the switch is in the on position standard equipment