Klein storage boxes are offered with a choice of compartment sizes and arrangements. Boxes feature strong rigid heavy-duty welded construction. Full-length piano hinged covers are designed to stay open for ease of access. 18-Inch x 12-Inch x 3-Inch storage box. Features 21 compartments. Fits 4-drawer extra-large slide rack model # 54477. For more than 160 years Klein Tools has manufactured premium-quality professional-grade hand tools that deliver the performance durability and precision needed to get the job done right. Klein isn't just the name of our company it's also our family name. Since 1857.