Packers and shims are both used in construction to level surfaces and ensure proper alignment. However, they differ in their specific applications, materials, and forms. Packers are often used to align, level, or support structures during construction, typically to level floors, align walls, or support windows and doors during installation. Shims, on the other hand, are commonly used to fine tune the position of components or ensure tight fitment, such as doors, windows, drylining, and joinery. Our shims and flat packers are available in a wide range of sizes and pack quantities.