Briwax Chair Fix's unique formula swells the joints, making them as tight as when they left the workshop and then seals them, stopping further shrinkage. It is great for all types of wood where round or square tenons join, such as wooden chairs, tables, staircases and other fine wood furnishings. It comes with a syringe and a set of needles(industrial), as well as an application cap to get into all those really awkward places. Chair Fix has been highly recommended by antique restorers and fine master craftsmen. Ideal for fluctuating humidity levels caused by central heating and air conditioning systems.