There are three different adjusting ranges for the seat height so that it can be adjusted according to different sizes and / or heights for working: 43-55 cm, 47-59 cm and 54-73 cm. The seat can be adjusted with help of a gas spring which is operated by a hand lever under the seat. All workstools are equipped with safety castors which keep the chair in its position when not sitting on it. All work stools have a highly polished aluminium base part and a chrome-plated column. The massive, chrome-plated footring avoids a sagging of the legs. These chairs are also available in an electroconductive version. The seats of the workstools have a diametre of 36 cm or 40 cm. As an alternative you can also get a seat with an ergonomically shaped conical design in the front part. This shape automatically helps taking away pressure from the surgeon's thighs.