1,professional and reputation 2,Years of factory 3,Rich experience 4,plentiful ... L-- pressure-locked C-- socket-weldingBearing bar centers:15-30, 40, 60, 80, 90 mm etc ... storage shelf,Attic panel, trestle, guardrail, sunshade gate, etc. Notes for ordering:1. Please clearly state ... and required surface treatment. 2. Please provide complete design-related layout plan, structural drawing, sectional view ...