Features: Size: Each spindle adapter is 12.5 centimeters long extending the length to help reach the staircase railing and ensure a secure fit. Compared to shorter alternatives it can adapt to more places. Y-shaped Design: The vertical shaft adopts a special circular Y-shaped design suitable for railings of different sizes at the bottom of stairs. The circular design can wrap around the railing better locking it in place than traditional Y-shaped designs. PVC Wrapping: The head is designed with PVC wrapping to better secure and protect furniture and the head pad has a strip texture for better grip and anti slip. Easy Installation: No tools required no damage to walls fast and convenient installation. All you need to do is remove the spindle that needs to be connected to the baby door dog door cat door or other pet door and then turn the replacement nut to respond to the wall. Practical: No tools required no wall damage fast and easy installation. Suitable for most places such as walls stairs smooth surfaces etc. fixed to installation parts such as railings or door frames. Specifications: Material: Steel+PVC Size: 6.8cm * 12.5cm Notes: 1. Due to the light and screen setting difference the item's color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement. includes: 2pcs * Spindle Adapter