Avoid drilling lag screws into your flat roof top or concrete pad, the EZ-NPP is recommended for high wind installations, providing a strong platform with cinder blocks for ballast (cinder blocks are not included). Ideal for non-penetrating flat roof and ground installations, the EZ-NPP tripod and mast assembly includes a sturdy, galvonized steel mounting platform. The platform is sized for four standard concrete cinder blocks as ballast. The EZ-NPP Tripod assembly is constructed of 18 gauge 1008-10 steel tubing, galvanized using the Flo-Coat (zinc-chromate-polymer) process for excellent corrosion protection. Ungalvanized mast collars, & connecting components are gold irridited for corrosion protection. Mast collars feature a captive "stop-nut" design, to eliminate lock nut spin when tightened; and a mast supporting cup for additional stability. Tripod height 20 inches. Supplied with one mast for an assembly height of approx. 66" inches. Add up to two mast extensions (see below, EZ-125-35M) to extend the height of 31" per mast extension.