JACK * Type: Single needle industrial sewing machine – Lockstitch * Use: Clothing, fabrics, tailoring and daily sewing. * Needle: Often DB×1 system for normal models. * Thread count: Upper thread + lower bobbin thread. * Stitch length: Often up to 5 mm in similar JACK machine categories. * Foot lift: Usually around 5–13 mm depending on the model. * Speed: Similar models reach about 5,000 stitches/minute. For sale