This Stanley 3-In-1 Tool Organiser is made from 2mm Polypropylene plastic so it is tough and durable. When closed the case has a robust structure that provides durability and security whilst transporting. The case has a 15kg weight limit. Other features include movable dividers that provide specific configuration for smaller parts and / or tools and power tools, and a central rigid tote that is perfect for hand tools. Each side is fitted with a polypropylene lid to keep everything in its place.