Easy to install. High applicability. Stable and modern-looking. For most bathroom sinks, such as glass/ceramic/copper container. Package list: 1x polished chrome mounting ring, 2x rubber ring. Material: plastic and polished chrome. Standard dimension-outside diameter: 80mm (3.15"), inside diameter: 40mm (1.58"), thickness:12.5mm (0.5"). As a kind of modern and pretty mounting ring with polished and chrome-plated surface which works with sinks of various materials, it is stable, safe and easy to install while it prevents the the round bottom sink from sliding around.