Application: For RVs, caravans, motorhomes, boats, motor homes, etc. Material: Made of plastic and metal, sturdy and durable, long service life. It is also suitable for exterior doors and lockers. Features: Small and durable, stronger than the non-spring option. It can withstand stronger gusts, but it also requires force to release the door from the lock. Easy to install: Easy to install, only the screw is needed, excluding screw accessories in the package. Package contents: Includes 2 pieces of door retainers.