Package & SizeThe package includes 6 black spring automatic locks (each lock is equipped with screws for easy installation). The overall dimensions of the snap closure are approximately 45 x 37mm and 3mm thick. Automatic spring lock, your security butler. High quality materialThe door lock is made of high quality solid aluminum alloy, built-in automatic spring, high strength and resistance, no rust , corrosion resistant, strong and durable. Excellent DesignThe snap closure is one piece and will not interfere with unwanted spot weld appearances. The inner ring of the door latch is equipped with a high frequency spring and a thickened base. The round pull ring is ergonomic and more comfortable to use. Easy to install Align the door bolt with the door and door frame and make a mark. Drill holes in the frame and doors and screw them with the screws provided. WIDE APPLICATIONSSpring door screws are used to fix small doors and windows, door locks of barn, pet cages, attics, patio doors, desk drawers, lockers, cabinets and more.