Features: 100 sets high quality silver grommets(with washers), its inner diameter is 3/8 inches (10mm). Includes 3 installation tools, solid and sturdy for long term use: hole puncher, base, and hammer. Heavy duty steel setting tools with fine edge, easy to set the grommets. Used for fabric, leather, bags, shirt, shoes, tents, small crafts, etc. Comes with a plastic box for easy storage.