Quickit Shelving Upright Extensions Quickit shelving upright extensions offer a flexible solution for customizing the height of your retail shelving units. Available in 300mm and 600mm mm sizes, these extensions are compatible with both standard 60 mm uprights and heavy-duty 80 mm uprights. They are ideal for transforming low gondola shelving into high gondola configurations, allowing for increased vertical display space and enhanced product visibility. Whether you're expanding existing units or creating nonstandard upright heights, Quickit extensions provide a reliable and modular upgrade path.