Product Name: Flat Washer;Weight: 7g; Used for motherboard to prevent electrical short from metal to metal contact.Fit for mother board standoff to use screw.Washers are normally used to distribute loads of threaded bolts, screws, nuts, and evenly as the fastener is tightened.Intended for the general use under the head of a bolt or nut in order to provide a smooth-bearing surface.colour: blackMaterial: Nylonsize: Thickness: 1mm / 0.04 inch; Inner Diameter: 3mm / 0.12 inchOuter Diameter: 6mm / 0.24 inch; Standard: M3Package Contents: 200 x black flat gasketOnly 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.