For shoulder & supination-pronation exercises. Used in the same way as a conventional shoulder wheel and wrist machine. A wall mounting unit suitable for small clinics is adjustable in height and radios and fitted with calibrated sensitive resistance mechanism, resistance is controllable from zero to maximum by tightening the strap. A 360 deg. scale is provided on the drum to measure and record the degree of revolution from either direction. Adjustment bars are chrome plated. Comes with wall fixing bolts.