1,Cylinder for electric eyelet buttonhole sewing machine. 2,Stainless steel with magnet. 1,With magnet. 2, With PU cushion in the cylinder,the piston will be stable and without impact while reaching the end. 3, With stainless steel piston rod and tube,aluminium alloy cylinder cover and piston,this cylinder is good anticorrosive. 4, Machining the spare parts with high precision CNC lathe and CNC ...