Square Silo made of high strength steel S350GD, fully galvanized Z-600 (600 gr/m2) with vertical and externally bolted reinforcements. Completely bolted joints with 8.8 bichromated bolts and nuts with rubber washers INCLUDED. Metallic structure support and hot-dip galvanized reinforcements Z-600 (600 gr/m2) INCLUDED. Preformed butyl mastic (BSD) to seal connections panels and to join cylinder and cone together INCLUDED. Fixing plates with fixing bolt/plug to the ground INCLUDED. Access ladder on the roof with protection according to UNE-EN-ISO 14122 as OPTIONAL.