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What is a builder’s profile?

Shop for Builder’s Profiles
Builders Profile A builder’s profile, also known as a corner profile or brick profile, is a tool used in wall building. It provides an accurate guideline to build your wall straight and plumb (vertical).
Builders Profiles A builder’s profile removes the need to build up corners first. This allows the user to accurately build complete courses of bricks easily.
  Wonkee donkee says some builders profiles require 3 courses of bricks to be built before it can be used
Internal and External Corner Profiles They are available for use on both internal and external corners, as well as being available for use along the wall (intermediate profiles).