Product description: Fast Clip Bar Chairs are designed to make steel fixing and traceability easier, with each chair identified by cover depth. The two head sizes available accommodate different bar sizes; one for 4mm to 20mm and another for 20mm to 36mm diameter bar. Each chair has an in-built four –legged cross base for stability and is designed to achieve only minimal exposure. Furthermore, if greater stability and even less exposure is required clip-in bases, which are available in 15mm and 25mm heights, are available.