Package & Size The package contains 6 automatic spring locks White (each lock is equipped with screws for installation). The total size of the automatic spring lock is about 45 x 37mm, and the thickness is 3mm. Automatic spring, your security butler. High quality materialThe door lock is made of high quality solid aluminum alloy, with built-in automatic spring, high degree and strength, rust resistance , corrosion resistance and durability. Excellent designThe spring lock is one-piece, which does not affect the appearance of unnecessary spot welding. The inner ring of the door lock is equipped with a high frequency spring and a thickened bottom. The round pull ring adapts to ergonomics and is more comfortable to use. Easy to install Align the door bolts with the door and door frame and make marks. Drill holes in the frame and the door and screw with the screws provided. Widely UsedSpring elastic door screws are used to fix small doors and windows, barn door locks, pet cages, attics, yard doors, desk drawers, lockers, cabinets, etc.