ClipsShop TIDY Grommet Dies are designed for the ClipsShop TIDY Pneumatic Grommet Machine. The die is constructed of stainless steel with a patented spring-loaded design that holds the grommet securely in place. All sizes except #00x and #0 are self-cleaning with a center hole in the bottom half of the die to allow the slugs/cuts to drop into the collection drawer below in the machine. ClipsShop TIDY Dies set ClipsShop self-piercing grommets.