【✔】High Quality 304 Stainless Steel Belleville Spring Washers Assortment Kit
【✔】Made of 304 Stainless Steel Material, Very Good Corrosion Resistance, It Can Be Used in a Humid Environment
【✔】Set Includes 7 Most Used Sizes: M3 M4 M5 M6 M8 M10 M12【Metric, please See Picture 2 for Specific Dimensional Size】
【✔】Package Quantity: 128-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
【✔】The Belleville washer also called cupped spring washer or conical washer,is a type of spring shaped like a washer.it has a frusto-conical shape which gives the washer a spring characteristic.(from wiki)