Sell self-locking spring balancers

Spring balancers with the capacity of 1-3KG and 3-5KG have the self-locking function. It's model is SW1-3 and SW3-5.
The self-locking function is means when you pull and unloose the spring balancer hook bounced back, and when you pull and unloose again, the hook will keep still. Not up and down.
The self-locking spring balancer stroke is 3.0 meters, and the net weight is 1.6KG.
Shell Material: Aluminum. This material has better way of heat faster.
Original: Shan Dong China.
Brand: Finer
Models: SW1-3, SW-3-5.
Payment: T/T in advance, as the quantity can be negotiated.
Price: Please contact us.
Freight: The sellers assure it.
Package: standard, seaworthy, export package.
Lead time: have stock, or depended.