Advantage: The countersunk washer is made of anodized aluminum alloy, providing durability and resistance to corrosion. The flat cup head design ensures a flush and secure fit when used with screws. The vibrant color adds an aesthetic touch to your projects. Instruction: To install the countersunk washer, simply place it between the screw head and the surface being fastened. Tighten the screw to secure the washer in place. This washer is good for use in applications where a flush finish is desired. Application: The countersunk washer is a versatile and durable fastener that can be used in a variety of applications, including automotive, construction, plumbing, electrical applications, industrial settings, robotics, DIY models. It can be used to fasten metal, wood, plastic, and other materials, and is good for applications where a flush finish is desired. Note: When using the countersunk washer, be sure to choose the appropriate size for your application. It is also important to ensure that the washer is properly seated between the screw head and the surface being fastened to prevent damage or failure. The countersunk washer is a versatile and durable fastener that can be used in a variety of applications, including automotive, construction, plumbing, electrical applications, industrial settings, robotics, DIY models. It can be used to fasten metal, wood, plastic, and other materials, and is good for applications where a flush finish is desired. Washer Size: 8x23.5x6mm (ID * OD * H);Screw Size: M8x20mmKey Wrench Length: 46mm / 1.81 inch Color: red Material: Metal Package Contents: 40 x Countersunk Washer 40 x Screws 1 x Key Wrench Only the above package content, other products are not included. Note: Light reflection 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.