3m (0.5+3m) - 160 mm(6.5") dia., mirriorpolished, acidproof stainless steel arm w/ s-160-1ft hose joints. Includes: wall bracket, hose and hood. External hydraulically suspendid parallelogram arm. Free flow in the hose. Incredibly easy to move ans stays in position. Can easily be demounted and sterilized in an Autoclave.