Industrial computer sewing machine for medium & heavy materials. Automatic thread trimmer,thread wiper,back stitch. .FuctionAutomatic thread trimmer,thread wiper,back stitchSewing materialsFor medium & heavy dutyUSEMinimum LubricationNeedleDB × 1 9-16#Needle Guage5 mmNeedle bar stroke31 mmPresser foot height6 16 mmTacking speed5000 rpmThread trimmerrotary knifeMachine head DriveDirect drive ...