The Dritz Grommet Tools are used to apply functional grommets to a variety of DIY sewing and repair projects such as shower curtains, tents, backpacks, duffle bags, garments, purses and totes. Use these grommet tools to apply 3/8 inch (9.52mm) grommets. Package contains: 1 set of grommet tools. For applying Dritz 3/8 in (9 mm) grommets