Features: brand new and high quality High-quality material: stainless steel, strong and durable, thickened material, thickened screw. Punch-free installation: each lock is equipped with a for key, slowly rotate the for key through the hole, only need to use the for key to control the track, no additional installation tools. Wide range of spacing adjustment: about 13-55mm/0.51-2.17inch can be adjusted, suitable for sliding for windows of most families. Essential items: Fix for windows to prevent children from falling and prevent thieves. Suitable for families, hotels, schools, kindergartens, etc. Specifications: Material: Stainless Steel Color: Black/White/ Silver Gray Style: Single Hole / Double Hole/Square Hexagonal for Key/Square Flat-angle for Key Size: As the Picture Shows Package Includes: 1x Window Safety Lock（with for Key） note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.