The hinge is small in size and has a supporting force of 90 degrees, which can take up a large space. ; Easy to install - anyone can install it with a screwdriver, no drilling required Features: Made of sturdy steel to withstand heavy loads, ideal for interior wooden doors/doors Ball bearing hinges are popular for their smooth operation, durability, and can withstand higher loads than standard hinges. Usually used for interior doors. Typically used on thick wood or glass doors To ensure fire doors stay closed in the event of a fire Suitable for smoke extraction door assemblies Product name: Hidden sliding hinge 90 degree limit hinge performance: Maximum radial static diameter: 625N Average democratic limit coefficient: 420N Maximum initial static diameter: 205N Maximum average limit coefficient: 204N Maximum retention coefficient: 18.2N Recessed cabinet door packaging: 2 pieces