Thin, often tapered, pieces of metal available at a major home improvement retailer are employed to fill small gaps or spaces between objects. These are typically used to achieve a level or plumb alignment, or to provide a uniform spacing. An example of their use is leveling a toilet on an uneven floor before securing it in place.
These items offer precise adjustments in construction and renovation projects. Historically, wooden alternatives were common, but the durability and resistance to compression offered by metal versions provide longer-lasting stability. This ensures the longevity and structural integrity of installations, preventing future issues like wobbling or misalignment.