Spring Hook Design: The hook lock achieves locking by pulling the plate to compress the spring and release the plate lock, allowing you to open and close the door more flexibly and conveniently.Package Contains: 6 pcs x Safety Hook and Eye, 6 pcs x Eye Screws; Hook Latch Length: 76mm/3"; Hook Latch Aperture: 5mm/0.2"; Eye Screw Size: 30 x 3mm/1.18 x0.12 inch(L x T); Eye Screw Aperture: 6mm/0.24"; Thread Size: 15 x3.8mm/0.59 x 0.15 inch(L x D).Material: The hook pin is made of stainless steel, the surface is galvanized, anti-corrosion and anti-rust, strong and practical, the spring can be pulled multiple times without deformation, and can be used for a long time in various environments.Simple to Use: Select the appropriate installation location, mark and secure it with the matching lifting eye screws, fix the lock body on the door, and install an eye screw on the door frame to ensure that the lock tongue can be accurately inserted into the screw and locked.Application: Can be used indoors or outdoors, suitable for fixed family farm gate, bathroom door and window, barn doors, screen doors, etc.