- Round spacers made of ABS, perfect for electronic and DIY applications - Includes 200 units with dimensions: 4.2 mm inner diameter, 7 mm outer diameter, and 25 mm height - Provide electrical insulation and maintain constant height in boards and components - ABS material: lighter and more resistant than metal, does not rust or break easily - Specially designed for M4 screws, ideal for PCB manufacturing, power outlets, and electronic equipment - Prevent short circuits, bending, and twisting in electronic boards - Reusable and easy to install, optimize assembly and project safety - Recommended for computers, 3D printers, and other electronic devices