RECOMMENDED FIXINGS Wall fixings are not supplied with this item. As substrate can vary considerably, we do not recommend particular fixings, but we suggest that chemical fixings should be your first option for solid brick/ block and coach bolts onto timber frames constructed from a minimum of 75mm x 75 mm soft wood. We cannot however accept liability for your choice of fixing and recommend that all hinged arm support products are installed by an experienced and competent fitter.