Adhesive: Widened and thickened base with strong glue ensures firm installation without falling off. Spring: Built-in spring offers silent buffering and cushions door impact. : Strong suction holds door securely and reduces shaking. Material: Stainless steel base remains and does not deform easily. Installation: Two methods available - with punching or without - for setup. Broad utilization: ground door stopper can be applied on most smooth surfaces, suitable for any apartment, school or office, heavy door, glass door, balcony door or window sash and more., Manufacturer: KXCVBNKLJ