The MAKPAC Interlocking Storage Box with Inserts, 6-1/2" x 15-1/4" x 11-5/8" (P-84137) is a two-way hinged design that offers plenty of space for accessories and can be securely connected to a MAKPAC case (sold separately). The Innovative stackable case design for efficient organization, transporting, and protection of tools. The Interlocking latches secure the lid shut and can link multiple boxes together. It’s part of the Makita MAKPAC Interlocking Storage System.