Low Noise and ideal Sleeping: The 40 mm grommets are built in nanoscale silencing Roman ring to smoothly slide on curtain rod and protect the rod with lower noise and less friction; Protect you from noise interference and improve your sleeping environment The rotary punch has an inner diameter of 57.5mm and is designed to cut holes ranging from 1.9-2 inches; Hole sizes can be freely adjusted using a side screw; The punch rotates to cut holes, speeding up work and providing ease of use; The rotary punch is suitable for large projects, and the anti-slip particles on the back prevent fabric from Re-open and Re-use: they can snap together solidly, but can still be taken apart for adjustments, convert non-grommet curtains into grommets, when changing curtains, the removed curtain grommets can be reused Package Includes: you receive 1 rotary curtain punch and 50 curtain grommets; The grommets feature a silent ring in the middle and are , making them easy to slide smoothly and effortlessly; They are quiet and easy to the curtain rod Wide Application: Except for the replacement kit of the curtains, they are also nice accessories for shower curtain rings, fabric rivet, boot eyelet repair kit and DIY backpack hole bag ring etc, Manufacturer: Koolenry