Manual retractable steel shelves have 6 layers, each layer of double-sided storage, 12 cargo space, each cargo space bearing 5 tons, total storage capacity of 60 tons. Each layer of cantilever can be shaken out of use by hand, single hand shake out 5 tons of cargo, each cargo position separate shake out operation use, there is no order between the layer and the layer, lifting is also, use the cargo position to shake out that, simple and convenient operation.