Grommet kit: 200 sets of eyelets in 4 colors, gold, gun, bronze and silver, 50 sets per color The 3-piece eyelet tools include 1 base, 1 punch and 1 installation tool. Copper eyelets: made of durable, strong and solid copper Size: inner diameter is approx. 1/4 inch (6 mm), outside diameter is 3/8 inch (10 mm), barrel length is 1/8 inch (3 mm). Easy to use: you can Easily use the grommet kit to repair yourself These are useful accessories for leather, tents, awnings, canvas, tarps and other fabric items. Handy grommet tools: They can be applied to punch a hole on leather objects, leather thongs or clothing, then hammer to push eyelets together. Proper way of storage: all eyelets and tools are contained in the clear compartment storage box, which makes it more convenient to find the corresponding components.