Endura’s Trilennium multi-point door-locking system is made in the U.S., has three deadbolts, and uses a solid, one-piece I-beam along its entire length to improve security and even increase door-stile stability. Unlike some multi-point locks that require individual releasing, the Trilennium deadbolts all release with the turn of a single handle. Available in a variety of handle styles and metal finishes, the Trilennium costs approximately $300 for a single door and $500 for a double-door setup. trilenniumlocks.com

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