Durable Material:Our grommets kits are made of premium iron, which is strong and durable.They would not be out of shape in the daily use, even if they are used for a long time.Size information: The grommets' inner diameter of the grommet is .1/2 inch/ 12 mm, the grommets' outer diameter is .3/4 inch/ 19 mm, the grommets' length is .5/32 inch/ 4 mm, light and portable, easy to deal with.Easy to Use: Easy to be fixed on the dies of grommet machines and grommet tools, then you can press to push grommet and washer together to get an on the material(washers are included).Suitable for : Use as curtain grommets, grommets for fabric, as for canvas, or use as banner - our self-cutting are the all- perfect solution What's included: You will obtain 500 sets unfinished grommet , each set includes 1 piece grommet and 1 piece washer, can meet your long-term using and replacing.Material: metal Color: Gold Package Contents: 500 x Grommet Tool Kit(1 piece grommet and 1 piece washer) Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.