This O-ring kit is a practical choice for dealing with various sealing and maintenance needs, it contains 595 O-rings covering 36 specifications with an inner diameter range of 3mm to 17.04mm, providing sufficient options for different sealing scenarios; the O-rings are made of rubber material which has the property of withstanding high and low temperatures, maintaining stability and not easily deforming during use, so they are suitable for the maintenance and sealing of automotive air conditioners, HVAC systems, compressors, faucets and pipelines, while the kit design focuses on convenience, the O-rings are stored in a plastic box by size with a size comparison table allowing you to quickly locate and take the required specification, whether it is home users handling daily maintenance or professionals carrying out equipment maintenance, this kit can accurately adapt to needs and play a practical role.