Question 1

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

Accepted Answer

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.

Question 2

What is the diameter of the posts?

Accepted Answer

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!

Question 3

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

Accepted Answer

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.

Question 4

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

Accepted Answer

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”!

ASIN	B01LYBQXRH
Additional Features	Adjustable
Age Range Description	Adult
Amazon Bestseller	#113 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #1 in Utility Racks
Brand Name	Amazon Basics
Color	Black
Country of Publication	China
Customer Reviews	4.2 4.2 out of 5 stars (247,446)
Finish Types	Chrome Plated
Furniture Finish	Chrome
Global Trade Identification Number	00841710155334
Included Components	No
Installation Type	Freestanding
Item Depth	36 centimeters
Item Dimensions	91.4 x 35.6 x 137.2 cm
Item Dimensions D x W x H	35.6D x 91.4W x 137.2H cm
Item Type Name	Steel Rack
Item Weight	12.68 kg
Manufacturer	Amazon
Manufacturer Part Number	SL-SUAM-7
Material Type	Alloy Steel
Model Number	SL-SUAM-7
Mounting Type	Floor Mount
Number Of Shelves	4
Number of Items	1
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	kitchen
Required Assembly	Yes
Room Type	Kitchen
Shape	Square
Shelf Type	Tiered Shelf
Size	4 levels
Style Name	No Casters
UPC	841710155334
Unit Count	1.0 Count
Weight Capacity	Maximum weight: 635 kg
Weight Capacity Maximum	635 Kilograms

Amazonベーシック 4段スチールラック棚メタルラックキッチンラック耐荷重635kg 幅91.4 x 奥行35.6 x 高さ137.2cm ブラック

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Amazonベーシック 4段スチールラック 棚 メタルラック キッチンラック 耐荷重635kg 幅91.4 x 奥行35.6 x 高さ137.2cm ブラック

Details

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Description

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Amazonベーシック 4段スチールラック棚メタルラックキッチンラック耐荷重635kg 幅91.4 x 奥行35.6 x 高さ137.2cm ブラック