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A particularly interesting term in that its two different meanings are indicative of opposite ends of the quality continuum.

1. When used to refer to tools of the trade that might be used by contractors, this term is used to indicate tools that are very rugged and of the highest quality.

2. When used to refer to the equipment & materials that a contractor, when left to his own devices, will install in a house or building, this term means the least expensive materials the contractor could get his hands on to get the job done.
1 - Look at this hammer - it's contractor grade.

2 - Just install some contractor grade cabinets; we don't have to live in it.
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