Why you need these spacers Provide precise, repeatable spacing so fasteners stay centered and components align correctly. Prevent rubbing, shorting, and misalignment that cause mechanical wear or electrical faults. Durable construction and a polished finish keep assemblies reliable over time. Key benefits Reliable fit: Precisionengineered inner bores keep screws centered and secure for stable assemblies. Durable material: Made from aluminum to withstand regular use and mechanical wear. Clean appearance and protection: Polished silver finish improves looks and helps resist erosion in machinery and fixtures. Flexible selection: A range of inner diameters and lengths covers common spacing needs across multiple projects. Product features Material: Aluminum for longlasting performance Finish: Polished silver to enhance appearance and erosion resistance Quantity: Set of 10 pieces Sizes: Inner diameters (ID) include M3, M4, M5, M6, and M8 Length range: From 3 mm up to 70 mm Typical applications (how it solves real problems) 3D printers: Use spacers to secure and align PCBs, stepper motor mounts, or sensor brackets so moving parts remain square and reliable. CNC machines and robotics: Maintain consistent clearances between structural parts and fasteners to reduce vibration and improve repeatability. Measuring equipment and instrumentation: Separate sensors, circuit boards, and mounting plates precisely to avoid interference and ensure accurate measurements. Compatibility and use notes Designed to accept M3–M8 metric screws (IDs M3, M4, M5, M6, M8) — select the matching spacer ID for your fastener. Lengths from 3 mm to 70 mm allow for short standoffs or longer separation needs without compromising fit. Suitable for mechanical builds, prototyping, repairs, and upgrades where secure, centered fastening is required. Includes 10 aluminum round spacers with polished silver finish, inner diameters M3, M4, M5, M6, M8, and lengths spanning 3 mm to 70 mm.