The inner diameter of the curtain ring is 30mm/1.18in, suitable for curtain rods less than 27mm/1.1in, please note the size when purchasing; the plastic curtain hook is 30mm high and 14.5mm wide, suitable for most curtains. The curtain rings and hooks are made of high-quality materials, the metal rings are polished and and not easy to deform, and the plastic hooks have high pulling force, good load capacity, flexible and safe. Easy installation: Just use the metal curtain hanging rings to pass through the curtain rod in turn, and then hang the curtain pin hooks on the rings, no other tools are needed, it is easy and convenient, saving time and effort. Wide application: The exquisite combination of curtain hanging and metal curtain pin hooks, suitable for all kinds of curtains in bedroom, living room, study room, kitchen and so on. Colour:Black Material:Metal+Plastic Size:Inner diameter:30mm Package Contents: 50 x curtain rings 50 x plastic curtain hooks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.