This NESCO 1/2'' 5 Hole Round Cast Aluminum Box is designed for weatherproof applications, ensuring durability and reliability in outdoor environments. It comes complete with a cover and gasket for a secure installation.The NESCO RBK550S is a 4-inch round outlet box made of cast aluminum. It features a 1/2 inch hub size and is designed for weatherproof use, including a cover and gasket. The box has 5 holes.