Cork borers sets of 6 and 12 rvfm ch107243 this 12 piece set of cutters is for boring holes into cork or rubber stoppers and bungs to allow the insertion of glass or plastic tubes etca single cutter of the desired diameter is simply twisted round using the handles while applying pressure on to the stopper a push rod is also included for removing the waste material from within the cutter rvfm cork borer set of 12