Briwax Chair Fix's special formula swells the joints, making them as tight as when they left the workshop, then seals them, which stops further shrinking. It is appropriate for all types of wood where round or square tenons join, such as wooden chairs, tables, staircases and other great wood furnishings. It comes total with a syringe and a set of industrial needles, as well as an application cap to get into all those truly uncomfortable locations. Chair Fix has been highly recommended by antique restorers and great master craftsmen. It is ideal for varying humidity levels triggered by central heating and air conditioning systems.