Size:20mmThe small diameter of the eyelets still comes loose? Inner diameter 20mm, outer diameter 30mm, eyelets to help you repair, once installed, firmly fixed, no more worry!Other uses: For DIY, leather, jeans, suitable for replacing old eyelets or DIY items or tarpaulinsPacking information: The package includes: 50 sets of eyelets, (each set includes 1 eyelet and 1 washer) Size: Inner Dia: 20 mm, outer dia: 30 mm, Uses: Using to repair canvas, tarpaulin, tent, awning, swimming pool cover, etc. Color: Silver Material: Metal eyelets, plastic storage boxNote: 1. Remember to use a wooden support to avoid damaging the hole cutter tool 2. Wear protective gloves when using 3. Can mark on fabric before use