1. High -strength and high -plastic aluminum alloy boxes greatly improve the product strength while maintaining lightweight self -weight.

2. Two -level variables and short handles make the operation more labor -saving.

3. The handle that can rotate 360 ° can be provided in a limited space.

4. The sprocketing mechanism that can rotate freely on the empty gear ensures that the chain can pass quickly and lightly.

5. Closed and automatic braking systems effectively eliminate the impact while keeping the brake clean and dry.