Description:No tools needed to install, you can easily assemble the two parts of the curtain ring together.Smoothly slide on the curtain rod and protect the rod with low noise.Beautiful decoration, great for a curtain rod, shower curtain ring, hanging curtain, the locker room door curtains ring, DIY backpack hole bag ring.Specification:Material: PP plasticInside Diameter: 42mm/1.65"Outside Diameter: 78mm/3.1"Thickness: 11mm/0.43"Recommended punching hole diameter: 50mm/2"How to Use:Step1: Use the pen to draw a circle with the appropriate size for the ring on the curtain where needs to cut out.Step2: Cut out the circle with scissors.Step3: Divide the curtain ring into two parts, respectively place them above and below the opening of the curtain, snap together.Step4: And so on, install all the needed grommet (Usually the space between two rings is approx. Hang them up on curtain rodsPackage Included: 16pcs x Curtain Grommet