... bar centers:15-30, 40, 60, 80, 90 mm etc. with 30, 40 mm recommended.Cross bar centers:any greater ... Belt corridor, storage shelf,Attic panel, trestle, guardrail, sunshade gate, etc. Notes for ordering:1. Please clearly state specifications, types, quantity ... our customers. We have established business relationships with lots of customers both at home and abroad with high quality goods and service ...