Size-The diameter of the small hole is 15mm and the diameter of the large hole is 18mm, which can be slightly stretched when used, Suitable for round door handles and flat door handles. Safe material-Our door buffer is made of high quality PVC material, non-toxic and tasteless, with slight elasticity, suitable for most door handles. Application: -Our door stopper can be installed on the door handle, such as kitchen or bathroom door handle, ideal solution to prevent damage to walls and furniture. can eliminate slam noise completely. Convenient to Use: - No tools required, no drilling or gluing needed, just install it on the door handle and get going. Invisible Design: - Transparent color makes this small port block almost invisible in the door handle, only to protect you and your family silently.