Reduce the chance of theft with the highest security mailbox on the market! This 9-Door 4C Horizontal Mailbox features nine double walled tenant doors. Each outgoing letter slot features a sawtooth guard to prevent mail from being fished out, and a smaller Carrier Access Door provides smaller pry points and increased overall strength. Made from a high strength, stainless steel, the USPS approved 4C Horizontal mailbox units were designed with an utmost regard for security and perfection. The secure double-wall door design increases pull test capacity on each door to 1500 lbs of pressure. A flush surface design and concealed hinges make tampering with and prying open mailbox doors close to impossible. >Units quickly install between wall studs, Protective Lock Rim prevents lock twisting & torque, 3-Point Lock Cam secures the door in 4 places, Flush Surface Design prevents dirt and ice build-up, Closer tolerance reduces the size of pry points, Each of the 9 doors measures 3-5/8" x 13-1/4" Overall dimensions: 42"H x 16"W ADA Compliance, Recommended for Indoor Use Only