Self Lock Mechanism: The Foldable Brackets Features Spring-Activated Quick Release Lock That Assures Stability By Locking In The Open Position. One Simple Press On The Release Lock Allows The 90 Degree Angle Support to Fold Down and Out of The Way Smoothly for Your Convenience . Easy Operation: The Quick Release Shelf Support Hinges Lock at 90 Degrees. When You Want to Collapse The Table Simply Press The Release Arm, Excellent Performance for Saving Space and Keeping Your Room Organized and Tidy . Wide Applications: These L Shaped Corner Brace Brackets Can Be Used for Folding Or Extend Tables, Folding Partition Frame, Folding Door and Much More, Ideal for Various Do-It-Yourself Jobs Around The House . High Load Capacity: with Convenient Foldable Design and Sturdy Construction, The Self-Locking Bracket Features Max Load Capacity Up to 50 Kg/110 Lbs When 2 Pcs Gift Are Used. Suitable for Making Custom Folding Furniture In Stores, Workshops, Backyard, Kitchen, Balcony, Bathroom and More . Sturdy and Durable: Made of Heavy Duty Steel Plate with Maximum Corrosion Resistance and Durability, The Foldable Extension Table Leg Support Brackets Are Made to Provide Constant Support for Years to Come .