The Prime-Line H 3957 Spline Socket Casement Window Handle has a smooth 360-degree operation that allows you to easily open and close windows as needed. The spline socket crank handle features durable, diecast construction with a white finish, as well as easy installation. A Phillips head screwdriver is required for the easy slip-on installation of the window handle crank. The 3/8-inch bore is held firmly in place with the supplied set screw. The casement window crank handle replacement can be used on 3/8-inch spindles, including on most casement operators. For all dimensional information please refer to the line art and compare to your needs before purchasing.