This is a tool for adjusting your cutters to the rotational axis of your lathe. This will help to prevent breakage from facing with a tool set too high, or poor surface finish with the tool set too low, or too high.
Car Paint Materials: Iridescent Layers / Carbon Fiber / Leather
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The Magical World of Aquascaping/Living Terrariums (WITH PICTURES!), page 1
18 Blend: Plastic material node setup - Blender cycles
An invitation to look at your tool collection in a whole new way...
12 Ways To Add Texture With Tools You Already Have | WoodworkerZ.com; Some, but not all, of these would work with metal.