Size: M8(8mm) bolts fit a pressure mount door with a spindle diameter of 8mm, please determine the size before purchasing. Each spindle pole is 12 cm (4.7 in) long, extending the length to help reach stair railings and ensure a strong and secure fit. Capable of fitting in more places than shorter alternatives. Adjustable & Extra Length Bolts:The Baby Gate Rail Adapter for Stairs has an adequate length of 4.7" (12cm). Extra long wall mount accessories screw rod adapter bolts that you can adjust the size to reach your stair gate railing. It may fit baby gate railings in many places, and is also ideal for pet, dog, and cat pressure-installed safety gates that require replacement hardware parts kits. "Y" Shape Design: The shaft uses a special rounded Y-shaped design, which is suitable for different sized railings at the bottom of the stairs. The rounded design can wrap around the railing and lock in place better than the traditional Y-shaped design. The head wraps the rubber design to better fix and protect the furniture, and the head pad has a strip texture for better grip and non-slip. Easy installation: No tools required, no damage to the wall, quick and easy installation. All you need to do is remove the spindle that needs to be attached to the baby gates,dog gates,cat gates or other pet gates and turn the replacement nut to react against the wall. Material: The pressure-mounted safety gate spindle rod is made of steel and rubber, which is strong for long-term use. Specifications: Product Name: Baby Gate Y Spindle Rod Color: Brown Material: Metal + Plastic + Silicone Thread Diameter: M8 (8mm) Thread Length: 12 cm/4.7 inches Package Includes: 2 x Y Spindle Banister Gate Adaptors Features The banister adaptor for baby gate is not only suitable for pressure mounted baby safety gates, but also ideal for pets safety gates, such as dogs and cats. Notes Please CHECK the detailed size before placing an order. Please allow slight size differences due to manual measurement. Please allow slight color difference due to different monitor.