1. Material: aluminum alloy 2. Hole-free card-type installation, easy to open and close, randomly fixed 3. Space aluminum material, durable, free from rust trouble 4. Can freely control the width of the window, to prevent children from opening the window and climbing out 5. Easy to install, simple and flexible operation, applicable to a variety of doors and windows 6. Restriction ventilation, to protect childrens home safety 7. Size: - Ordinary model: about 16 x 30 x 19mm - Wider model: about 24 x 30 x 19mm
