A central stone at the summit of an arch, locking the whole together with the central principle or part of a policy, system, project on which all else depends.

The keystone is a symbol of what Bren-Mar Construction has become, a single stone that holds the entire structure together. Composed of the skills, experience, insight, practical and technical knowledge that has been acquired over the years, Bren-Mar Construction is the keystone to a successful project.