stainless steel provides excellent corrosion and rust protection. The flat washer provides a bearing surface for fastener load distribution or is used as a spacer between components. Intended for the general use under the head of a bolt or nut in order to provide a smooth-bearing surface. Product Name: Flat Washer; Color: Silver Tone; Material: Stainless Steel Thickness: 0.3mm / 0.01 inch; Inner Diameter: 2mm / 0.08 inch Type: GB97 Outer Diameter: 5mm / 0.2 inch; Standard: M2 Weight: 6g; Package Content: 200(+/-2%)PCS x Flat Washer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.