SIZEExternal size: 8x 3.9x3.2,Inner size: 5.5x3x2.2, 2 cable ports, 2 snaps, 2 cable clamps, 2 rubber gaskets, Perfect for sealing 10/12/14/16 gauge cable(maximum compatibility 15mm cable) braided cable and flat cable.(Hand-measured, slight error) IP54 WATERPROOF: Made of heavy-duty reinforced PP material, it is rigorously tested to IP54 waterproof, high temperature and -40 freezing, can withstand up to 300 lbs. and is resistant to rain, water, snow, dust, dirt.Suitable for protecting outdoor power outlets, row plugs, timers, extension cords, adapters etc.