This kit makes it easy to fix your greenhouse down securely into concrete, paving slabs, decking or even soil. The brackets are profiled to grip the inside of the greenhouse base plinth with fixing holes on the inside. The brackets are fixed from inside the greenhouse with coach screws fixed down into the concrete, paving slabs or decking. If you want to site your greenhouse on soil you will need a concrete trench around the perimeter or smaller pockets of concrete into which the brackets can be fixed. You can fix the base plinth down with screws and wall plugs but it is much easier with our profiled brackets. Fixing the greenhouse down is recommended at all sites. The pack includes 4 purpose made brackets, 4 heavy duty zinc plated coach screws, 4 washers and 4 matching plugs to ensure a neat easy fit. The picture shows the contents of a pack of 4 brackets. Two sections of green powder coated base plinth can also be seen with the brackets correctly fitted.