Made of High Quality Zinc Alloy. Better Preservative and Better Wear Resistance. Sliding Patio Lock: These Universal Locks are Designed for Most Hinged or Sliding Doors and Windows, Used to Lock the Window or Limit the Window. Coming with Keys: Each Sliding Door Locks are with 2 Keys.(The keys are Universal). Also These Sliding Patio Locks are Supplied with All the Security Fixing Accessories. Enhanced Security：The patio door & window locks are designed for sliding doors and windows, good choice for your home security and baby safety EASY TO USE:Easy to Install the Locks and Convenient to Use, Supplied with All the Security Fixing Accessories, Include Caps Stainless Steel Screws