- Black ABS round spacers, designed to insulate and maintain constant height in electronic assemblies - Includes 100 units with 4.2mm inner diameter, 7mm outer diameter, and 8mm height, compatible with M4 screws - High-quality ABS material: does not rust, is less brittle than metal, and offers great durability - Ideal for PCB boards, computers, 3D printers, and power outlets, preventing short circuits and deformations - Design with intermediate partition that provides stability and additional protection - Reusable and easy to install in DIY, hardware, and electronics projects - Efficient solution to maintain separation and insulation in electrical and electronic systems