Prevents tails from getting caught with a sponge door stopper. Locks the lever to prevent escape by children who jump to open doors. ◇ Installation method: Insert from the bottom of the knob and lock while turning towards you. *Effective when set on the tip side. Can be installed for door and knob spacing of 4.5-5.5cm. ◇ Prevents tails from getting caught. ◇ Also for children who jump to open doors. ● Size (approx.): Width 11 x Depth 3 x Height 16cm ● Weight (approx.): 30g ● Main material: EVA ● Made in Japan ● Installable size: Door thickness up to 3-4cm, door and doorknob spacing up to 4.5-5.5cm Slightly used, but works without problems. I am selling it because I have no opportunity to use it.