☆ This is a stopper that holds the door slightly open with light force. ☆ Uses (examples): ventilation, allowing small pets to come and go, alleviating a sense of confinement, etc. The stopper will detach when the door is opened, so there's no risk of being trapped. ☆ Compatible Knobs: Lever-handle type (those where the handle/axis passes through a hole with a diameter of approximately 3cm). May not be compatible depending on the lever shape or door. ☆ Door Opening Direction: The part is symmetrical, so it can be used on either the left or right side. ☆ Opening Amount: Approximately 10-12cm (varies depending on the knob shape and how the attachment is installed) ☆ Product: ① Stopper ② Attachment (spare 1) ③ Spare adhesive sheet ☆ Size: ① Approximately 25 x 5cm ☆ Color: White ☆ Material: Polypropylene ☆ How to Use (A simple installation manual is included) (Preparation) ① Stick the attachment to the door frame (with adhesive sheet). ② Pass the round hole of the stopper through the lever handle. (When in use) Open the door slightly and hook the corner hole of the stopper onto the attachment. To release, pull out the stopper or simply open the door. The attachment's claws will flex and detach from the attachment. ☆ Handmade product (original product): This was made for the interior doors of my home. Due to being handmade, there may be variations in shape, imperfections in the craftsmanship, and scratches. Please purchase only if you understand that this is a handmade product by an individual. ☆ As a bonus, you can also use it as a door card by attaching a message and hanging it outside. (^^♪ ☆ The stopper is sheet-shaped and has some warping. ☆ The parts may detach depending on the installation method and usage conditions. ☆ It holds the door with light force and cannot be used on doors that are heavy to open or have dampers. ☆ This is a transaction between individuals, and we cannot guarantee against damage or accidents, so please understand and acknowledge this. ☆ Shipping: Will be shipped via regular mail (non-registered). ☆ If you are considering purchasing multiple items, please let us know in the comments before purchasing, and we will accommodate you with a combined shipping price. ☆ I'm tooting my own horn, but I made this for ventilating my room, and my family liked it, so I decided to sell it. I understand that it may not be compatible with all door knob shapes, but I hope you'll give it a try. Thank you. Door knob, pet door, cat door, children's room, ventilation, alleviate confinement, claustrophobia