Mail Boss, Black 7155 Surface Mount Base Plate

Mail Boss 7155 Surface Mount Base Plate is a good quality, well-built base plate that provides the necessary security for your mailbox. The actual inside dimensions are 3 & 7/16 x 3 & 7/16 inches and it accommodates an 1/4 inch screw with 8 holes, one on each corner and one in the middle of each side. Although it is not designed for a 6x6 or a 4x4, you can buy a post to eliminate any problems. When it comes to mounting it on a concrete slab, you need 8-1/4" x 4" concrete screws. It is recommended to Consider security hardware for installations to prevent the theft of the mailbox. The base is a secure option, but the powder coating quality is not fantastic.