Well for the price, but better on thicker material. Like other customers, they recommended going slow when using the cutter as well as "crimping" the grommets with a hammer, utilizing General Tools grommet kit. Installing these grommets on polyester shade material, the grommets cut through, but "installed" reinforced packaging tape on both sides, with the tool cutting a perfect hole. The tape worked very well. Used inside a green house so not worried about corrosion or heavy duty strength, very little weight applied on these grommets with no wind.