Electrical Receptacle Box Extender 1/2" Single Gang Extends Existing Single Gang Electrical Receptacle Box 1/2" Use This for New Drywall Applications or As a Mud Ring Underwriters Laboratory Listed, 3.3 CI Easy To Use - Constructed of Non-conducting Blue U/L Listed PVC Material Two 1-1/4" 6/32 Zinc-Plated Steel Machine Screws Included