Description: Product Type: High precision compression type wavy wave crinkle spring washers assortment kit. Quality Meterial: They are made of carbon steel can provide good strength, hardness and abrasion performance. Package: Different diameters and thicknesses washers totally 320pcs are stored in a transparent plastic box, convenient for your storage and use. Feature: Curved spring washer resist loosening through vibration rely on elastic force. Widely Application: They are perfect 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. Specification: Material: Carbon Steel Size Chart: 30Pcs: 3x6x0.3cm/1.18x2.36x0.12inch 30Pcs: 4x8x0.3cm/1.57x3.15x0.12inch 30Pcs: 5x10x0.3cm/1.97x3.94x0.12inch 30Pcs: 6x12x0.3cm/2.36x4.72x0.12inch 30Pcs: 8x13x0.3cm/3.15x5.12x0.12inch 30Pcs: 10x15x0.3cm/3.94x5.91x0.12inch 30Pcs: 12x18x0.3cm/4.72x7.09x0.12inch 30Pcs: 14x21x0.3cm/5.51x8.27x0.12inch 20Pcs: 16x21x0.3cm/6.30x8.27x0.12inch 20Pcs: 19x25x0.3cm/7.48x9.84x0.12inch 20Pcs: 24x31x0.4cm/9.45x12.20x0.16inch 10Pcs: 27x34x0.5cm/10.63x13.39x0.20inch 10Pcs: 31x39x0.5cm/12.20x15.35x0.20inch Package Includes: 1 Box M3-M31Carbon Steel Wave Washers(320Pcs Included)