What is the fine-grained topic of the following text: "From aluminum to steel, soft plastics to hard ceramics-matter the material, the Spiro series can achieve highly precise plane parallelism (≤ 1.0 µm) for precision bearings, pump gears, valve plates and more," said a company spokesperson. Only return the topic.
The Spiro series' ability to achieve highly precise plane parallelism on various materials.