In a cylindrical knife holder rotatable about its longitudinal axis, at least one groove is present. The lighting device includes LED’s operated upon the opening of a rotatable door have a directional pattern for optimum illumination. Also included, is a source that can apply a time varying forcing function to the battery through the Kelvin connectors. In some embodiments, a screw hole insert is also provided to resist shear forces acting between the screw and fixation plate. For such a purpose, the display device contains a display element, which is activated upon completion of the working process and contains the comment \u201cLog\u201d, indicating the option of issuing information relating to measurement and operational values that have been saved prior to andor during the last completed working process.