RACO 768 4-in. Square Mud-Ring Cover For 1 Device, 5/8-in Raised, is used to fit 4 in. square electrical boxes. Raised device covers/rings are used in finish wall applications to mount switches or receptacles. This item features angled mounting slots that allow for correction of box misalignment. It is made from pre-galvanized steel. From the Manufacturer Hubbell Raco 8768 4-Inch Square Mud-Ring, For 1 Device, Raised 5/8-Inch . Raised device covers/rings are used in finish wall applications to mount switches or receptacles. For single wiring device. Angled mounting slots allow for correction of box misalignment.