SIZE：10 pcs curtain grommets. Inside diameter: approx. 4.2cm/1.65", outside diameter: approx. 7.5cm/3" These eyelet curtain are designed for curtain rod with 1-3/8 inch diameter. APPLICABLEUSE: for DIY to decorate your fabric, bags, shirt, shoes, curtain, drapery, pillows etc.Great accessory for window curtain rod, window curtain ring, shower curtain ring, locker room door curtains ring, DIY backpack hole bag ring, canvas, boots, carpet, etc INSTALL ：You can use a rubber hammer to assist in the installation and closing. It is worth noting that if you do not have a rubber hammer, you must use cloth or other soft materials to wrap the iron hammer to knock; If you have great strength, you can press two pieces with both hands for installation. Applicable to multiple scenarios : Our products can be used in a variety of environments, outdoor, underwater, inside the machine, fishing ground, fishing boat, indoor, etc. the products will not rust and age easily. Once installed, they will be tightly fastened and will not fall, and will continue to help you. LOW NOISE：The eyelet kit has a built-in nano silencing ring, which can slide smoothly on the curtain rod to protect the curtain rod with lower noise and less friction. Protect you from noise and improve your sleeping environment.