I need precision parts made of various materials (steel, ceramics, aluminium) with machining processes (polishing, milling, EDM) into various levels of surface finish.

For example, it could be a few steel blocks, each made with EDM, milling, polishing respectively. And the milled blocks are milled into a few roughness levels.

Are there samples like these that are readily available for purchase, like surface comparison blocks. And what are the prices for these samples?

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