Carlon B121ADJ Outlet Box, New Work, 1 Gang, 3-3/4-Inch Length by 3-7/8-Inch Width by 3-3/8-Inch Depth, Blue Material: Non-Metallic Color: Blue Wiring System: Non-Metallic Sheathed Cable Work: New work or retrofit upgrade applications Mounting Method: Adjustable Bracket Patented design allows for adjustment from 0 to 1-3/4-Inch after installation Ideal for new work or retrofit (old work) applications Backless low voltage bracket and floor box designs available Ideal for various drywall thicknesses and wall finishes All PVC boxes are permissible for use with 90 degree C connectors