【Adjustable Tension for Versatile Lids】Equipped with dedicated hex keys , you can fine tune the hinge tension by turning the screw . This allows easy adaptation to lids of varying weights , keeping the lid stable and moving smoothly at all times 【Precision Fit for Smooth Use】Designed specifically for lids , these hinges work best on flat , non curved surfaces . They ensure unobstructed , smooth opening and closing for optimal performance 【Beginner Friendly Installation】A drilling template is included for quick , accurate screw hole alignment . No professional skills are required , even first time users can complete the installation independently 【Flexible Mounting with Any Angle Hold】Supports both left and right side installation , fitting lids with 75°-110° opening angles . The lid can be held securely at any desired position for flexible use 【Heavy Duty All Metal Build for Strong Load Bearing】Crafted from premium zinc alloy , the full metal structure supports up to 17.6 lbs per pair . It is ideal for small wooden toy boxes , storage chests , jewelry boxes , and more, Manufacturer: Zhjiutak