1:single needle automatic industrial sewing machines 2:high quality and favorable price ... :Max. Sewing speed:5,500rpm, 4,000rpm4:Max. stitch length:5mm, 4mm ,3mm5:Needle bar stroke:30.7mm ,29mm, 35mm6:Lift of ... knee: 9mm3):By hand: 5.5mm, By knee: 13mm 7:Needle:DB×1 (#14), DA×1 (#9), DB×1 (#21)8 ... .We welcome all the buyer to visit our company. single needle automatic industrial sewing machine