Garvin AMR0 4" Square to Round Telescoping Depth Device Ring, 1/2" to 1-1/2" Raised Depth, Steel

This Adjustable 3/4 in to 1-1/2 in raised device cover is used with 4 in square boxes installed in ceilings walls and floors when finished surface depth is unknown. You will always get a perfect flush installation to finished surfaces ensuring that devices are securely fastened and well grounded to rings. Their telescoping round inner ring adjusts to finished wall surface for a perfect fit every time!