The Side Handle (191R81-4) is for use with the Makita 40V max XGT® Brushless 1/2" Right Angle Drill (GAD01) and the 40V max XGT® Brushless 7/16" Hex Right Angle Drill (GAD02). The Side Handle provides additional control for increased stability during certain applications. The 191R81-4 is a replacement handle both the Makita GAD01 and GAD02 right-angle drills. It is made of quality materials for long life.