Sometimes it is crucial to keep a certain door or window closed tightly, for instance, to prevent children from getting into trouble or facing danger. Jackloc window and door constrictors allow you to control how far to open windows and doors. They are useful in hotels, care homes, hospitals, and schools as well as in average homes. The great benefit of Jackloc products is that they are suitable for any kind of material and window, thus being universal, so you can place them virtually anywhere. The original Jackloc cable restrictor contains a five-disc locking barrel and becomes immovable after you have fitted it. Jacklocs have many variations because they come in all lengths and with different colours and finishes, many of which you can spot on eBay. With a key, you can remove the constrictor quickly if it becomes necessary. Moreover, spare keys are widely available should you lose the original. Do not opt for less than a proper Jackloc when it comes to safety and security.