ReceptXtenders - Electrical Receptacle Box Extender - 1/2" Double Gang Extender Extends Existing Double Gang Electrical Receptacle Box 1/2" Use This for New Drywall Applications or As a Mud Ring Underwriters Laboratory Listed, 5.6 CI Easy To Use - Constructed of Non-conducting Blue U/L Listed PVC Material Four 1-1/4" 6/32 Zinc-Plated Steel Machine Screws Included