Materials: Our Carabiner Hook is made of 304 stainless steel. Therefore, it is elegant, strong, lightweight and practical, don't worry about the carabiner too heavy, it is a great tool for hikers, campers, photographers, or anyone who carries a bag. The carabiner can be placed directly in the schoolbag or briefcase Feature: This Stainless Steel Spring Carabiner has a spring-loaded gate that allows them to be quickly and securely attached to a wide range of attachment points. It works smoothly than the spring-loaded gate, it is easy to attach important items to a pack or belt, etc. Usage: These Spring Snap Hook with Carabiner are ideal for many everyday applications. Whether as a key ring or for attaching items to a backpack, luggage, baby carriage or for hanging ropes or cords when camping, fishing, hiking or traveling if you are not satisfied with the product, you can always send us an email, provide you with satisfactory service in the first time Product Description Specifications: