Features: There are 18 different size to meet your different needs at work. Crafted from aluminum to ensures long service life. Very suitable for replacing old aluminum gaskets or damaged aluminum gaskets. Equipped with a small box, which is very suitable for you to sort different sealing rings. They have good electrical and thermals conductivity. The insertion paper have the actual size, so when box is opened, it is easy to identify the required pad size. Specifications: Component:Aluminum Size:40pieces 6x10x1.0mm, 40pieces 6x12x1.0mm, 40pieces 8x12x1.0mm, 40pieces 8x14x1.0mm,40pieces 10x14x1.0mm, 40pieces 10x16x1.0mm, 20pieces 12x16x1.5mm, 20pieces 12x18x1.5mm, 20pieces 14x18x1.5mm, 20pieces 14x20x1.5mm, 20pieces 16x20x1.5mm, 20pieces 16x22x1.5mm, 20pieces 18x22x1.5mm, 20pieces 18x24x1.5mm, 20pieces 20x26x1.5mm,10pieces 22x27x1.5mm, 10pieces 22x29x1.5mm, 10pieces 24x29x2.0mm Package Includes: 450Pcs Aluminum Washer note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.