Material: The stair gate screw is made of high quality steel core screws and ABS plastic, sturdy and durable. The door wall protector is made of high quality ABS and rubber, sturdy and non-slip rubber that prevents holes, scratches or other damage to your walls. Size: Screws stair gate: M10 thread, 3.5cm/1.37inch in diameter, screw bolt is 8cm/3.14inch in length. Door wall protector: 8cm/3.14inch in diameter, 2.5cm/0.98inch in thickness. Easy to install: no tools needed and no damage on the wall, just twist the nut and create a reverse force against the wall, quick and easy to install. Simply place wall cups between the set screw bolts and the wall with your hands, the gate wall protectors stay more stable in place. Note: Replacing the gate screw d The stair is only suitable for M10 pin hole, please check the pin hole of your pressure baby carrier first. Suitable for stairs, doorways, walls or any other smooth area where doors need to be installed. Wide Application: The door wall protector is suitable for most pressure doors. Such as child gate, baby safety gate, passage gates, baby gates for stairs, pet gates with door, child safety gates, stair gates for toddlers, the shower tension bar, the kitchen, etc.