Durable Material: The metal zipper puller is made of zinc alloy and electroplating, sturdy and durable,serve for long-term use, not easy to break or deform. Easy to Open and Close: Used these zipper clip lock to keep your backpack a little more secure during business trips and they work great! Easy to open and close but not so easy that someone could get into your bag without you knowing. Product Size: Small zipper clip measures 1.25 inch (3.2cm) long, 0.55 inch (1.4cm) wide, large zipper measures 1.96 inch (5cm), 0.82 inch (2.1cm) wide, medium zipper measures 1.57 inch (4cm) long, 0.7 inch (1.8cm) wide, proper size and easy to grasp. Double Opening: Very easy to operate. Just clip it on and instantly and securely attached. You can use it wherever you want. This hook carabiner has two gates with sliders to lock them in place, so you can clip items like keys to one side, then clip the other side to your backpack or pocket. Used in daily life for suspending key or Backpack's leash, etc. Used in outdoor sports such as camping, fishing, hiking, and travel, it also can be used as handles to hang items. Wide Application: You can apply them to hanging bags, backpacks, tents, keychains or other small items, they are suitable for your daily use or many other outdoor activities, such as parties, outdoor sports or camping.