1, Each lock has 2 keys, so that you can keep 1 for spare use. 2, Anti-rust surface treatment before painting, 5 years warranty . 3, Multi functional for storage, there are 2 shelves inside, shelves' height is adjustable, very practical for offices, schools etc. 4, Fully disassembled structure, unit packing volume just about 0.1cbm and one 40HQ can load 680pcs, you can save a lot of shipping and warehouse cost.