Flat Packers 4.0 x 28mm Grey (1000/Box)

Flat Packers with a 4mm thickness and 28mm width. Colour‑coded polypropylene shim for precision positioning of window and door frames. The flat, rigid faces distribute load evenly to maintain accurate alignment during installation. Made from moisture-proof, non-corroding polypropylene for long-term stability in timber, uPVC, and aluminium frames.Chamfer-free edges ensure maximum surface contact beneath screw heads and frame feet, while the non-staining material protects the substrate’s appearance.