Material: The stair gate screw is made of high quality steel core screw and ABS plastic, sturdy and durable. The door wall protector is made of high quality ABS and rubber, sturdy and non-slip rubber prevents holes, scratches or other damage to your walls. Size: Stair gate screw: M10 thread, 3.5cm/1.37inch in diameter, the 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 to the wall, just twist the nut and create a reverse force against the wall, quick and easy to install. Just put wall cups between pressure screw bolts and wall with your hands, gate wall protectors stay more stable in place. Note: The stair gate screw replacement is only suitable for M10 spindle hole, please check the spindle hole of your pressure baby gate first. Suitable for stairs, doors, walls or any other smooth areas where gates need to be installed. Wide Application: The gate wall protector is