Rec 614 Rectangle, Opening 6-1/4"x13-1/4" Rec 614: Opening 6-1/4"x13-1/4" Back 5-3/4"x12-3/4" Standard depth all models 3-7/8" Produced of corrosion resistant alloyed aluminum Has an elastometric-waterproofing and anti-fracture coating combined with an aggregate bonding base Supplied with wall fasteners which may be used with/without pre-installed wood blocking.