What is this?Aluminum Gaskets are decor for Screw RC/FPV/PC/Drone/Mechanical Accessories Model Parts, etc.What will I get?Screw Gasket,is in size of:Washer dimensions,Outer diameter:7.9mm/0.31 inch;Hole diameter:3mm/0.12 inch;Thickness:2mm/0.08 inch;Color:Sky Blue;Material: Aluminum Alloy;In the package of:60 pcs M3 Countersunk Washers;Is there any advantages of the product?Washer is made of aluminum alloy, light weight,wear-resistant and hard.The screw washer is anodized to prevent rust and.The surface is smooth and bright without burrs, the pattern is evenly distributed, and the process is beautiful,uniform force, anti-slip and anti-loose.How to use it?Aluminum washer has small volume, light weight and convenient installation and use.