Coverts 90° and curved corners (12" to 17") work surfaces to usable work areas which allows for more efficient use of the corner area. Permits the attachment of an adjustable arm and keyboard platform where the natural corner of the worksurface does not allow it. Allows user to move 2” closer to worksurface. Specifically designed and engineered for model #321RL Combo Platforms. Will also work with other WorkRite combo platforms.