This is a weather proof electrical outlet cover in original box with # WR79CLEV. The item is 4-1/2" long by 2-3/4" wide. It has a foam gasket that fits to your liking. There are special grooved cutouts in the gasket for your special needs. The opening is 1-9/16" in diameter by 3/8 thick. It has a twist on cap that has the same foam insulator. The inside thread diameter is about 1-3/4". Attached to the cover and cap is a 3-1/2" ball chain to keep the two items together. The two mounting holes are about 5/32" in diameter and are about 2-3/8" apart measuring from the middle of each hole. Also included is a packet of 2 screws for mounting.