PACKAGE INCLUDES - 1 window retainer with screws. Suitable for all common plastic, wood, or metal windows and doors. STURDY AND DURABLE - Our window stays are made of metal, not easy to rust, strong and durable, with a long service life. EASY INSTALLATION - Window locks are easy to install. Each window opener comes with screws; you only need a simple screwdriver to attach it. No drilling required. SAFETY PROTECTION - Suitable as a safety lock for children and pets. Provides a secure locking system for tilt-and-turn and inward-opening windows. Allows safe ventilation and fresh air flow. APPLICATION - Compatible with various sliding and casement windows to help secure openings. NOTE: Measurements are manually taken; please allow 1–3 cm variation. Color may differ slightly due to lighting and display settings. Actual product may vary slightly in appearance.