The DOT die set hand tool #22-RHT3GR is a manual grommet die designed for easy installation of #3 grommets, including plain, tooth, and neck washer styles. Featuring a hand-operated setting die with an easy-roll silicone head and an ergonomic wooden handle, this hand press grommet tool reinforces holes in fabric or other materials with precision. The 7/16 inch grommet tool is compatible with both brass and aluminum grommets and includes a plain grommet die set, tooth washer die set, and neck washer die set, making it a versatile grommet installation tool for patio decor and outdoor projects. Its robust design ensures secure grommet and washer placement without the need for complex machinery.