8mm x 13mm x 0.3mm Metal Wavy Wave Crinkle Spring Washers 100pcs Product Name: Wave Spring Washer; Material: Metal Weight: 18g; Package Content: 100(+/-2%) x Wave Spring Washers Main Color: Black; Inner Dia: 8mm/ 0.31" Outer Dia: 13mm/ 0.5" Thickness: 0.3mm