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Dominant features:1,The spring balancer crust adopts aluminium steel which is portable and hard to be destroyed and has good looking.
2, The crust is semi-covered and the hoisting cables are not easy to be locked. If the hoisting cables are locked, it is also easy to deal with.
3, The coil spring has high quality.
4, The spring balancer which has capacity below 5kg has instant lock and can be operated conveniently.
