Sturdy Stainless Steel Construction: Crafted from high-quality stainless steel, the crescent locks with 50 mm hole distance are designed for windows and doors, ensuring long-term durability Ideal for Aluminum Alloy Doors and Windows: These hook locks are engineered to provide secure and reliable protection, offering a sturdy and stable locking mechanism suitable for aluminum alloy frames Easy Installation for Sliding Windows: These sliding window latches are simple to install, providing a practical solution for securing doors and windows Product Dimensions: The window sash locks have a load length of 6.5 cm (2.56 inches), height of 2.4 cm (0.94 inches), and internal hole distance of 5 cm (1.97 inches). When the right window panel faces the room, select the right-hand crescent lock; when the left window panel faces the room, select the left-hand crescent lock Operation: When the blue indicator on the button aligns with the red mark, the crescent lock can be opened; when the red indicator aligns with the red mark, the lock is secured Specification: Material: Stainless Steel Size Chart: Load Length: 6.5 cm (2.56 inches) Height: 2.4 cm (0.94 inches) Internal Hole Distance: 5 cm (1.97 inches) Package Includes: 2 Casement Window Locks