The ClipsShop CSTON-1 grommet machine is the biggest, professional grade, hand press grommet machine on the market. One of the greatest features of the CSTON-1 is the fully adjustable spring mechanism within the machine that adjusts by turning the screw system on the top of the machine. This allows you to seat the grommets with the exact amount of force needed for your grommet application which makes it the most efficient machine for setting large quantities of grommets with the least amount of effort. The handle positioning makes it possible to work on the front side of the machine and allows a more precise grommet placement.