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Dull / Black Steel or AL

  1. Jul 15, 2013 #1
    I need a 5"x2"x1/8" 'cover' to protect some sensors from a drill bit. Occasionally the bit will run in to the cover and chip away at material, etc.

    I need the cover to be dull and black, coating with a surface treatment won't work because over time the coating will chip away. What are my options? Cover can be Al or Steel, cheaper is better, thanks for the help everyone!
  2. jcsd
  3. Jul 20, 2013 #2
    Some tungsten carbide would work good but be hard to mold
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