【4 Inch Self Closing Door Hinges】This 4-pack includes 4 inch self-closing door hinges with a 5/8" radius corner and 0.1" thickness. These hinges are ideal for heavy interior doors, bedrooms, bathrooms, kitchens, storage room doors, basement entrances, etc. (Please confirm door compatibility before purchase.) 【Self Closing】The spring loaded door hinges can close slowly, gently, and automatically when closing, avoiding the "bang" sound, protecting the door frame and door leaf, while reducing noise, and can also freely set the door to be closed or half-open. 【Sturdy and Durable】Spring door hinges meet UL listed ANSI Grade 1 standards to ensure safety and durability. Each door hinge is made of durable iron with an anti-rust surface treatment, which is wear-resistant and rust-resistant. 【Loading Weight】Each brushed nickel door hinge supports doors up to 40 lbs. When installed as a pair, these hinges support doors up to 100 lbs. For heavier doors, we recommend using three hinges for each exterior and interior door. Compatible with both left- and right-hand doors. 【Easy to Install and Adjust】Follow the steps in the instruction manual, just remove the old hinge with a screwdriver, replace the new spring door hinge, and adjust the screw with a hexagonal wrench to freely adjust the tightness, which is very suitable for beginners. Complete Set for Every Home Need: Each IQQ door closer hinge self closing kit comes with all the necessary components, making installation quick and hassle-free. Our hinges are ideal for: Heavy interior doors, Bedroom and bathroom doors, Kitchen and pantry doors, Storage and basement doors etc. Gentle and Silent Self-Closing Mechanism: Say goodbye to loud slamming doors! The spring door hinge technology ensures that doors close slowly, softly, and automatically, eliminating disruptive noise. This feature not only enhances comfort but also protects door frames and panels from damage caused by forceful impacts. Unmatched Durability and Safety: Crafted for longevity, IQQ self closing door hinges undergo rigorous anti-rust and wear-resistant treatments, ensuring they withstand daily use without corrosion. Additionally, they meet the UL-certified ANSI Grade 1 standard, guaranteeing top-tier safety and reliability. Superior Weight Capacity: Our spring loaded door hinges are engineered to support heavy doors with ease. Pair capacity 70–80 lbs (perfect for solid wood or reinforced doors) Single hinge capacity Up to 35 lbs. Universal design, works flawlessly for both left and right-handed doors The IQQ door spring hinge easy to install and adjust: Hex key adjustment for customizing closing speed. Tool-friendly installation for quick replacement. Screw tension control to fine-tune tightness Upgrade Your Doors with IQQ Today! IQQ Self Closing Door Hinges Classic and Versatile, Suitable for Different Home Styles. Experience the perfect blend of innovation and elegance with IQQ spring door hinges. Whether you're renovating or building a new home, our hinges ensure effortless functionality, lasting durability, and a polished look.