The screen door has super magnetic force, automatically closes in one second without sound, and closes tightly. Wide design and sturdy nylon thread make it stronger bearing capacity; eco-friendly and beautiful, durable and wear-resistant, it can be used for years - mosquito and insect repellent, animal and child friendly, it is ideal for the yard, the terrace, the balcony, etc. Size Selection: The size includes the border velcro, not the door size. Measurement method: First measure the inside width of the door frame, then add 5cm above as the product width; then measure the inside height, and add 4 cm above. Buy a larger size instead of a smaller one, but the final size must not exceed the outer diameter of the door frame or it cannot be installed. Easy to Install and Remove: No drilling required, quick installation in minutes. The supplied fastener is used for flat door frames of all materials and nails for uneven wooden door frames. The door curtain is easy to remove and will not leave any marks or Harm on the door frame. Fine mesh blocks the invasion of all pests and protects you and your family at all times. Enlarged magnet, stronger suction The large magnet is wrapped in quiet fabric and closes quickly without noise. 4cm upper design The upper velcro is widened to 4cm, more load-bearing. It will not fall off during use. Perfect workmanship, solid material Thickened coated edge cloth, super strong velcro and good quality shiny silk material make the product more durable. The product size includes the velcro, and it should be larger than the door size. First, measure the width and height of the inner frame, then the width + 5~10CM, the height + 4~10CM. So that the velcro can be installed on the door frame. The width of the left and right sides of the velcro is 2cm each, and the width of the top velcro is 4cm.Please follow the principle: Bigger than smaller. But the size cannot exceed the outer diameter of the door frame, otherwise the product cannot be pasted on the door frame.