Extend your Snap & Grow Greenhouse with the Palram Snap & Grow 6 x 4 ft. Extension Kit - Silver. Made with the same crystal-clear SnapGlas panels which are virtually unbreakable, this extension kit is easy to add onto your existing greenhouse to give you even more space for growing your plants. * Extends your Snap & Grow Greenhouse * Crystal-clear SnapGlas panels are virtually unbreakable * Panels lock into place easily * Simple to add onto your existing greenhouse * Measures 48L x 81W inches