What's the difference between single roller and double roller of luggage universal wheel?

What's the difference between single roller and double roller of luggage universal wheel? The answer is as follows:

1, the difference between them is that the roller can't rotate 360, but can only move back and forth, so the roller can only walk in a straight line. Double-row theory can rotate 360, turn and change direction at will, which is more convenient to use than single-row wheel.

2, related introduction: because it is convenient to use, carry clothes, etc. , widely used for traveling and going out. At the same time, the suitcase also has a pull rod for the box, which can be divided into single-tube pull rod and double-tube pull rod. The tube of the pull rod can also be divided into square tube and round tube, which is convenient for dragging when walking and greatly reduces the burden. The suitcase can be carried or dragged. The wheels of the suitcase we usually use are basically located at the bottom of the box. When traveling, most people will choose to use a suitcase because it is large and easy to carry.

3. English expression: suitcase

4. Material: cloth box, ABS hard box and suitcase.

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