This adjustable screw jack base is the foundation of any professional stage truss or lighting stand system. Engineered from Q235 structural steel with a galvanized finish, it provides precise height leveling and rock-solid stability for concert rigs, event setups, and permanent installations. Complete Kit — Everything Included Each set comes fully assembled with: X-Reinforced Base Plate — 120*120mm square steel plate with embossed cross-pattern for superior load distribution,