Features: Anti-loosening design: The cord automatically locks where you pull, and stay locked until the release button is pressed. You don't have to worry about stretching, burping, or relaxing. Multiple Uses: Can be used as a hook for growing lights, ropes and rope hooks. It can also be used as a pulley to adjust the tent rope. Help you finish the tent construction work easily. Scope of application: stable and smooth adjustment: fully adjustable, can be locked quickly, just pull the loose rope to adjust to the desired height. Ideal for pendant lights, hanging carbon filters and ventilation equipmentSpecifications:Size: large 7*4cm small 5*3.5cm Rope: large rope length is about 140cm, small rope length is about 200cmHook: IronPackage Contents:Leash*2