STANLEY FATMAX PROSTACK™ Foam Insert (430 x 70 x 300 mm) is part of STANLEY FATMAX PROSTACK™ interlocking stackable portable storage system – offering real versatility – whatever the task. Packed full of user-friendly features the PROSTACK™ system is the perfect partner to help you get the job done quickly and professionally. Each PROSTACK™ unit features a strong interlocking catch system to let you connect and disconnect units quickly and easily allowing you to build a storage system that is bespoke to you and your trade. Ideal for customising the inside of tool boxes to fit around power tools and accessories providing ample cushioning and protection during transportation.