The column angle, pass into the gourd holes, the rivet connection, convenient assembly and disassembly, no need of special tools, long, wide, high random combinations, laminates can be 38mm pitch can be adjusted up and down, to meet the various storage requirements. Manually applied to access the lighter goods, usually bearing for <200KG/ layer, are widely used in the electronics industry and small parts warehouse. Rack consisting of columns, beams, plates formed rivet.