In terms of installation combination, it is recommended that personnel with professional knowledge carry out the installation. Description This sewing machine features an automatic lubrication device for extremely stable sewing performance, as well as a large double-thread rotary hook that greatly improves sewing efficiency with a maximum speed of 3000 stitches per minute. It is a heavy-duty sewing machine with stable performance, suitable for sewing jeans, tents, leather products, etc.