High Quality Material: The automatic spring door latch is made of strong aluminum alloy, rust and corrosion resistant, not easily deformed, safety, sturdy and durable and long service life. Unique design: The spring door latch is made of solid aluminum alloy, the inner ring is equipped with a spring. When you need to open the door, pull the ring and when you close the door, loosen the ring. The internal spring is restored and the door lock returns to the locked state. Wide range of applications: bolt locks are suitable for fixing small doors, windows, cabinets, yard doors , high quality door locks provide extra security for doors and windows. Easy installation: line up the door screws on the door and door frame, and screw in the attached screws into the wood to fix them, the location can be installed according to your needs (please note the door opening direction) Security: the special design is different from conventional locks, the inner ring is equipped with a spring, is and has high hardness and strength, adding a lock increases security. Features: The door lock has high structural rigidity, long service life, and is not easily deformed. The special design makes it different from traditional locks and increases security, provides a wonderful replacement for your old or damaged door and window cabinets. Suitable for all kinds of doors, windows, cupboards, drawers, furniture, pet cages, etc. to protect your home, property and privacy. Technical data : Material: Aluminum Alloy Color: Black size: 57 x 43.7 x 42mm / 2.24 x 1.72 x 1.65in Package Content: 5 bolt lock 20 screws Note: The data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual item received shall prevail.