For fixation of peaces on tool machines (drilling mach.,milling machines....)BU 100Jaw width: 100mmWeight: 3,8kgCat. No.: Z061504XBU 125Jaw width: 125mmWeight: 5,2kgCat. No.: Z061505XBU 150Jaw width : 150mmWeight: 7,6kgCat. No.: Z061506X