JINYI 1. Heavy-duty 150lb/68kg maximum hanging weight per pair, helpful for hanging many things, such as tents, room fans, grow plant lights, etc. 2. Wide range of applications - widely used in plant lights, fans, ventilation systems, filters, reflectors, etc. Very useful in your daily life. 3. EASY TO USE - Adjustable length and locking design for your convenience, just attach the quick release carabiner clip to secure the object, then pull the cord until you reach the desired height. 4. How to use a. Fix the hook on the pulley in a firm place b. Use the end of the rope with the hook to hang the items c. Pulling down the end of the rope without hook can raise the height of the hanging object d. If you need to lower the height of the hanging items, you need to push the wrench in the pulley up, and pull down the rope with the hook at the same time. Quantity delivered: 4 pieces Size: as pictured Colour: Black Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.