Product Name: Flat Washer; Weight: 7g; Used for motherboard to stop electric quick from metal to metallic contact. Fit for mother board standoff to apply screw. Washers are usually used to distribute a great deal of threaded bolts, screws, nuts, and flippantly because the fastener is tightened. Intended for the final use beneath the pinnacle of a bolt or nut as a way to provide a smooth-bearing surface. colour: black Material: Nylon size: Thickness: 1mm / 0.04 inch; Inner Diameter: 3mm / 0.12 inch Outer Diameter: 6mm / 0.24 inch; Standard: M3 Package Contents: 200 x black flat gasket Only the above equipment content, other products are usually not included. Note: Light taking pictures and different displays could cause the color of the article in the photograph a little bit different from the real thing. The dimension allowed error is +/- 1-3cm.