ST-502 HD/JHD: Double needle chain stitch machine for seaming and hemming of PP/HDPE woven sacks. Specifications: Stitch Range 11-16/100 mm 8-14/100 mm Seam Double thread chain stitch No.of Needle 2 needle 2 needle No of Thread 4 thread 4 thread Needle size DNx1#25 DRx2#28 Lubrication Automatic oil bath system