Features: High Quality: Stainless steel with rust resistant material to ensure life-time use, these quality assortment washers are perfect for home, automotive, and shop use. Scientific Humanization Design: Open the case instantly easy to find what you might need. It also can be used as a storage box. The flat washer kit is very handy. Safe & Convenient: Using high quality material, which is environmental friendly , non- mercury and non-poisonous. When using them, there are no toxic substances releasing to ensure your safety. The nice Flat Washer assortment kit has plenty of the popular sizes M2~M6, which will match all your need. Multi-function: Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Ideal for spread the load of a screwed fastening and prevent loosening in industrial, shop, decks and fence building, automotive and home appliances. Save time & money: No need to search for dropped washers, just use one new washer. The 300 pcs washers and 6 different sizes will meet your maximal requirement. Specifications: Condition: 100% Brand New Material: Stainless Steel Color: showing as picture Flat Washers: Size: (Inner Diamter * Outer Diameter * Height * Quantity) 2 * 5 * 0.3mm * 30pcs 3 * 7 * 0.5mm * 30pcs 4 * 9 * 0.8mm * 30pcs 5 * 10 * 1mm * 30pcs 6 * 12 *1.5mm * 30pcs Spring Washers: (Size * Quantity) M2 * 30pcs M3 * 30pcs M4 * 30pcs M5 * 30pcs M6 * 30pcs Case Size(L x W): approx. 13 x 7cm / 5.12 x 2.76inch Weight: approx. 102g Package Included: 1 x 300pcs / pack Washer Set 1 x Case