ACCURATE SIZE: 2.9×5.5cm/1.2×2.2inch( Height: about 5.5cm; Outside diameter: about 3.65cm.) EASY TO INSTALL :Convenient for daily use.Dust cover is waterproof and keeping away from dust.Each socket has a retaining nut against a panel. HARD PLASTIC MATERIAL; Durable flame-resistant hard plastic, which is resistance to high current, high temperature and wear resistant,work perfectly with any car powered devices??and also you can use the connectors we offered for higher load capacity. 39.4 INCHES WIRE:Long wire can fit most car ,need not to worry about that the socket can??t reach the power. FUSE FOR OVER-LOAD PROTECTION: Any DC 12V/24V or high load capacity will be protected to burn when the current is to high.Don??t worry about the current in your car.