Product details:

Standard In-Ground Post features heavy duty construction of 4 in. square cross section of heavy gauge steel tubing with a mounting plate welded to the top and a durable powder coat finish. Designed for in-ground installation in concrete. Includes mounting hardware and instructions. Black non-reflective finish. Constructed from heavy gauge galvanized steel with a commercial grade powder coated finish for durability Holds a single mailbox Designed for in ground installation in concrete 4 in. x 10 in. mailbox mounting bolt pattern Dimensions: L 12.01 x W 5.98 x D 46.5.