[High-quality material] Our threaded spindle rods are made of steel core screws and ABS plastic, which are durable and reusable. The sturdy material will not break due to pressure.It helps to make the railing door fit firmly to ensure the safety of children or pets. [Safe and stable] This pressure screw makes your baby door more stable and will not malfunction. A great way to protect walls or stair railings, the rubber ends can protect your stairs from scratches. (Do not use at the top of the stairs) [Easy to install] Our threaded spindle has adjustable-length bolts, no tools are required, and no holes are required on the wall. These spindle rods work as well as factory bolts. Just rotate the nut to generate a counter force against the wall, which is fast and easy to install. [Wide application] It is suitable for all pressure doors, baby doors, pet doors, through ultra-wide, high doors, and safe child protection doors with doors. Suitable for all pressure-installed baby doors or pet doors. The 4-piece threaded spindle rod is replaced, allowing your old door to be put into use again, saving you the trouble of buying a new door. [Included in the package] 4 pieces of threaded spindle rod. Dimensions: Diameter M10 (10 mm), length 80 mm, top diameter 35 mm (1.38 inches), only suitable for M10 spindle hole. Not suitable for 8 mm screws.