The NPRM-2 is a pre-galvanized, non-penetrating roof mount that is ideal for TV antenna and wireless Internet antenna installations where standard mounting brackets cannot be used. Unlike similar non-penetrating roof mounts that are smaller and can only hold one layer of eight concrete blocks, the NPRM-2 has a surface area of 4' x 4' which can hold one layer of twelve concrete blocks for added stability and can support a large TV antenna on a 1½" to 2 ½" x 10' mast (not provided). An optional but highly recommended 1/8" x 35" x 60" EPDM rubber pad is available to go between the roof and the steel tray of the mount to help protect the roof.