The Fraser Oaks, Inc. Adjust-a-Ring™ - designed by an electrician for electricians. The only fully functional adjustable plaster ring.
The Adjust-a-Ring™ conforms to UL STD 514A and is certified to CAN/CSA STD C22.2 No. 18.1.
The Fraser Oaks, Inc. adjustable plaster ring cover is a listed product with Underwriters Laboratories.