1.Multi-function : The knotless hook integrates the functions of tensioning, tensioning, hanging, connecting, winding and securing light loads. It can effectively lock the rope to prevent slipping and easily adjust the length of the rope. Help with protect your tent from strong winds and heavy rain. 2.Self-locking structure : Pulley system with rope, very robust self-locking structure. Pass the rope through the hook, tighten it and it will lock automatically. No knots! Tighten the rope easily! 3.Suitable for different rope sizes : The rope tensioner is suitable for rope sizes from 2 mm to 2 mm. 4 mm, a perfect windproof device for tents. Strong capacity charging. 4.Small and portable : Made Made of high quality stainless steel, anti-corrosion, sturdy and durable. Small size 34x13x8mm, easy to store. put in a pocket or purse back, portable. 5.Wide useIt is easy and correct to link objects to; outside or outside. inside. It is an assistant for outdoor and daily binding, making everything faster and easier. Specification: Product material: stainless steel Size of product: 34x13x8mm Product net weight: 60g Packing list: 4 * automatic lock 1 * rope Notes: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is tolerance in the size of the product. product.