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.