... .single grommet , save cost and manpower save labour force manual grommet machine low price for sale ... use grommet machine for flex banner , the grommet is 2 parts/set, positive ring and negative ring. ... machine, press handle to finish it. It is too slow, and when put flex banner in ... operation is easier, work faster, can make around 1000pcs/hour; light weight, rivalrous price. save labour force manual ...