I'm very frustrated. the plastic shelf holders are not snapping and staying closed what am i doing wrong?

The clips don’t snap together all the way closed until you push the shelf down onto the clips. The gentle force of that shelf push is what closes them. Just make sure you attach the clips with the “top” and arrow facing up and just above the single grooves of your choice…not one of the double grooves…on the pole then slide them down the pole a little until they snap into that single groove. And be sure to slide the shelf on with the lip facing down. It’s too bad the directions don’t explain this about the clips because our brains think the clips should snap completely together when attached to the poles.

What is the diameter of the posts?

I don't know what diameter the other sizes are, but the 30" three tier shelf is only 3/4" diameter. I went off the previous answer when I bought three of these. Boy was I fooled when I received 3/4" poles. Smh!

Is it possible to turn the shelves around so that the edges of the shelves have a lip?

The answer is that you should not unless you are not planning to put much weight on them. The HOLES in the Shelves for the Brackets (standards) are Trapezoidal in shape. They are designed to work like Wedges with the Plastic Bracket pieces. The more weight is added to the shelf, the harder the bracket pieces are shoved together so they GRIP the Shelves ONTO the Poles (shelf stndards) keeping them in place. If you turn the shelves UPSIDE down, the Wedge Functionality is defeated. They will not be Nearly as sturdy and will be prone to Slipping down the Poles. Could you get Lucky and have them Not slip? Well Yes, if not much eight at all was on each shelf (30 to 50 Pounds). But assembled correctly, these should hold 350 pounds per shelf with NO Way to slip. Lessons learned from Ancient Egyptians, Romans, and Greeks. A KEYSTONE in an arch is the perfect example.

Are these the industrial size poles that are 1" so I can use shelves I already own?

Yes. They are 1” poles. I have 6 of the 14x30” 5 shelves units. I almost bought the wrong clips to add extra shelves because of the irresponsible answers given on here. So glad I measured and found that the poles are 1”!

Material	Alloy Steel
Colour	Black
Special Feature	Adjustable,Durable
Product Dimensions	35D x 91W x 142H Centimeters
Shelf Type	Metal
Number of Shelves	4
Room Type	Garage, Kitchen, Office
Finish Type	black
Assembly Required	Yes
Mounting Type	Floor Mount
Recommended Uses For Product	Garage, Kitchen
Included Components	wire shelf, pole, leveling feet,plastic clips,user manual, rubber wheel,anti-tipping restrain,plastic cover
Item Weight	24.7 Pounds
Brand	amazon basics
Style	4 Shelves
Shelf Weight Capacity	350 Pounds
UPC	840569100458
Global Trade Identification Number	00840569100458, 08405691004580
Color	Black
Shipping Weight	12.45 Kilograms
Item Model Number	WI143654BW
Frame Material	Alloy Steel
Item Part Number	WI143654BW
Primary material	Alloy Steel
Capacity	4-Shelf
Item Shape	Trapezoid
Assembly Type	Yes
Manufacturer	HUIZHOU XINWEIFA INDUSTRIAL CO LTD
Country of Origin	China
Imported By	Etrade

AmazonBasics 4-Shelf Shelving Alloy Steel Storage Unit on 3'' Wheel Casters, Metal Organizer Wire Rack (Black, 36L x 14W x 57.75H)

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