Revolutionary patented design expands from 2 in. to 3-1/2 in. for in-use needs. Heavy duty die-cast metal construction with premium powder coat. Patented Quick-Fit keyhole mounting system allows installation in under a minute. Patented Universal Fit Adapter System Technology (U-Fast) for 8-in-1 custom device configurations, comes pre-configured for GFCI. Lockable open or closed and fits full-size padlock. Adapter, gasket, mounting hardware and instructions included. Extra Duty rated. Vertical mount.