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By certification 
Features:
1.Sleeves: Available in plastic & metal material.
2.Assemble in minutes,no tools required.
3. Packing: 5 layers good quality strong cardboard. Suitable for sea shipping.
4.Shelves adjust every inch.
5.Different casters for your choice.
6.Other accessories for your choices.
7.The post are available in the size of 500 mm-2200 mm
8.This Shelf unit great for office,garage,kitchen,and more place.
1.Sleeves: Available in plastic & metal material.
2.Assemble in minutes,no tools required.
3. Packing: 5 layers good quality strong cardboard. Suitable for sea shipping.
4.Shelves adjust every inch.
5.Different casters for your choice.
6.Other accessories for your choices.
7.The post are available in the size of 500 mm-2200 mm
8.This Shelf unit great for office,garage,kitchen,and more place.