This air vent installation tool is very useful for installing press-in style grommets. Not to mention that it's the perfect companion to our handcrafted 100% brass vintage style air vents! 🙂 Our offerings of this style tool are a bit more expansive than most you'll find online, and I hope that you find that useful. Most companies only sell one version with the mentality that it's up to you to figure out how to modify it if necessary. In response to that approach, I have put together multiple sizes of these tools to best suit the variables that you may encounter in your drum adventures! The most prolific option on the market is an installation tool for 7/16" diameter air vents. However, those tools are only available in one length, have coarse threads on the bolt, and varying approaches to non-marring surfaces. While those tools can work well, I wasn't exactly happy with those characteristics so I revamped them a bit. The result is a set of tools that are easier to use and offer more consistent results. My air vent installation tools feature: - Fine thread pitch bolts to allow increased control of crimping force and reduce the amount effort exerted - All washers and hex nuts are stainless steel for longevity and smoother contact surfaces - Added an extra washer to increase rigidity during the crimping process, create a smoother/more consistent rolled surface, and increase the insulator's lifespan - Insulator is sized according to the installation tool size - which corresponds to shell thicknesses/air vent grip lengths