... , save cost and manpower steady manual single ring grommet machine Dimension: 150*150*100 mmMould size ... : standard 4 #or 6# ( 10and 12mm )Weight : 6 kg Usually , we use grommet ... /set, positive ring and negative ring. To make grommet need install positive ring, and negative ring, then put ... above problems. It only use positive ring, no need negative ring, save cost; operation is easier, ...