Swivel heads are NC heads with integrated tool spindles. The head supplies the tool spindle with electricity, signals, pneumatics and hydraulics. For turning applications, the spindles take up turning tools that have a fixed in position. Peiseler designs this interlock with a Hirth coupling, which allows for the adjustment of the spindle bearings without the influence of external loads. The result of this design is superior positioning accuracy and rigidity. The SKU series is designed with worm gears and the SKD series with direct drives.