Features: brand new and high quality High-quality materials: stainless steel materials are used, which are durable and anti-rust. Punch-free: Each lock is equipped with a for key, slowly turning the for key through the hole, only need to use the for key to control, no additional installation tools. Width controllable: freely control the window width to prevent children or pets from crawling out of the window. Necessary items: Fix for windows to prevent children from falling and prevent thieves. Application: Suitable for families, hotels, schools, kindergartens, etc. Specifications: Material: Stainless Steel Type: Single Hole Black/Double Hole Black/Single Hole Silver/Double Hole Silver/Single Hole White/Double Hole White/Hexagon for Key/Slot for Key Single Hole Size: Approx. 30x24x23mm/1.18x0.94x0.9inch Double Hole Size: Approx. 60x24x23mm/2.36x0.94x0.9inch Hexagon for Key/Slot for Key Type Size: Approx. 67x36x32mm/2.63x1.41x1.25inch (Size = LengthxWidthxHeight) 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. Package includes: 1x Window Safety Lock(with for Key)