Sturdy Stainless Steel Construction: Crafted from quality stainless steel, the crescent locks with 50 mm hole distance for window and doors ensure long term durability for your doors and window Ideal for Aluminum Alloy Doors and Window: Our hook locks are specifically engineered to provide secure and reliable protection, offering a sturdy and stable locking mechanism, great for aluminum alloy frame Easy Installation for Sliding Window: This sliding window latches are simple to install, offering a practical solution to protect your doors and window effortlessly Product Dimensions: The window sash locks are with load length 6.5 cm/2.56 inch, height 2.4 cm/0.94 inch and internal hole distance 5 cm/1.97 inch. When the right window faces the room, choose the right crescent lock; when the left window faces the room, choose the left crescent lock Portable Using: When the blue on the button faces the red, the crescent lock can be opened; when the red on the button faces the red, the crescent lock cannot be opened Specification: Material: Stainless Steel Size Chart: Load Length 6.5 cm/2.56 inch; Height 2.4 cm/0.94 inch Internal Hole Distance 5 cm/1.97 inch Package Includes: 2 Casement Window Locks