The lock is made of zinc alloy, it is safe and non-toxic. You can use the lock at home, and it can prevent your baby from being pinched by the window, which can keep your baby safe. Features: High quality: made of zinc alloy, safe and non-toxic, odorless and healthy. When you use the lock at home, it can prevent your baby from being pinched by the window. Reusable and Durable: Can be used repeatedly and durable for long time use. Easy installation and easy to use, just fix the lock by the screw. A very useful safety lock, keep your baby safe at home. Specifications: Condition: 100% Brand New Material: Zinc Alloy Color: White Large Lock Size: Approx. 16*24*13mm/0.62*0.94*0.51in Small lock Size: approx. 15*17*56cm/0.59*0.66*2.20in Two Hole Distance: Approx. 39mm/1.53in Weight: Approx. 75g/2.64oz Package List: 1* Lock 1* Key 4* Screw Note: 1. Please allow 0-2cm error due to manual measurement. Thank you for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. please take one as default.