1. Product Type: High precision compression type wavy wave crinkle spring washers assortment kit 2. Feature: Curved spring washer resist loosening through vibration rely on elastic force 3. Application: for electrical connections on household and commercial appliances, washers are normally used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened Product Name: Curved Spring Washer Material:Carbon steel colour:black Package Contents: 30 * 3 * 6 * 0.3mm Gasket 30 * 4 * 8 * 0.3mm Gasket 30 * 5 * 10 * 0.3mm Gasket 30 * 6 * 12 * 0.3mm Gasket 30 * 8 * 13 * 0.3mm Gasket 30 * 10 * 15 * 0.3mm Gasket 30 * 12 * 18 * 0.3mm Gasket 30 * 14 * 21 * 0.3mm Gasket 20 * 16 * 21 * 0.3mm Gasket 20 * 19 * 25 * 0.3mm Gasket 20 * 14 * 31 * 0.4mm Gasket 10 * 27 * 34 * 0.5mm Gasket 10 * 31 * 39 * 0.5mm Gasket Only the above package content, other products are not included. Note: Light 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.