Packers are small, durable spacers used to ensure precise alignment and level surfaces in construction and DIY projects. Commonly made from plastic or metal, packers are essential for tasks like installing windows, doors, flooring, and cabinets, where exact spacing is crucial for a secure fit and smooth operation.

They are available in various thicknesses and colours for easy identification, allowing for quick adjustments on-site. Packers help prevent sagging, warping, and misalignment, making them a key tool for achieving professional results in both large-scale construction and smaller DIY tasks.