Large CompatibilityOutdoor electrical box external size is: 12.9 x 8.3 x 5.2 inches, Inner size is:10.6 x 6.7 x 3.9 inches, with 7 cable ports compatible with AWG12/14/16 cord, flat cable and braided wire for diameter rang: 0.03''-0.38'' (0.8-10mm). KINDLY TIPS: Before purchasing, please make sure that our product size is right for you, so as not to be too big or too small for you, which will cause inconvenience IP54 Rated WaterproofIP54 outdoor extension cord box of Each inlet/outlet is equipped with a wire limit snap and rubber seal wrap that can be tightly formed around the cords keeping the extension cord box watertight, to protect outdoor & indoor plug connections to ensure circuit safety. (Note: It is just water-resistant. Do not submerge it in water) HEAVY DUTY WEATHERPROOFThe weatherproof electrical box is made with heavy-duty reinforced PP material that can withstand external damage, shocks or drops, and extreme weather such as heavy rai