4 in square 1/4 in 1-gang Device Ring are used with 4 in square boxes to mount switches, receptacles and devices. Their angled slots on the covers compensate for up to 12 deg of box misalignment on upright framing members. GARVIN® Device Ring, 1-Gang Square, 4 in Length, 4 in Width, 0.06 in Thickness, 1/4 in Raised, Steel, Galvanized