Facing issues with uneven doors, windows, or floors? Glazing Supplies Direct’s 6mm glazing packers provide precise levelling for DIY projects, eliminating the hassle. Each packer is colour-coded for easy thickness identification, so you can speed through projects with ease. Made in the UK from strong, recyclable plastic, these packers work reliably indoors and out. Compact, durable, a... https://www.amazon.co.uk/Glazing-Supplies-Direct-Plastic-Packers/dp/B0D2DF3M7K/?th=1