220pcs disc spring serrated safety washer knurled flexible gasket for aerospace industry Description: [HIGH QUALITY MATERIAL] Spring washers are made of premium stainless steel, which provides exceptional durability and rust resistance. [6 DIFFERENT SIZES] Includes a total of 220 pieces of spring washers in 6 different sizes (M3 60pcs, M4 50pcs, M5 40pcs, M6 30pcs, M8 20pcs, M10 20pcs), providing a wide range of options for all your needs. [COMPRESSION RESISTANCE AND HIGH TEMPERATURES] These washers have excellent compression and high temperature resistance, making them ideal for applications where high performance is required. [Easy to Install]With their small size and lightweight design, these washers are easy to install and are suitable for a wide range of industrial and mechanical applications. [WIDE APPLICATIONS] These spring washers can be used in a variety of applications, including automotive, aerospace, construction, electronics, and more. The package includes: 60 pcs. M3 conical knurled spring washer 50pcs M4 conical knurled spring washer 40pcs M5 conical knurled spring washer 30pcs M6 conical knurled spring washer 20pcs M8 conical knurled spring washer 20 pcs. M10 conical knurled spring washer