... operates smoothly.. Powerful unison feed. the machine can sew accurately and easily several sheets of heavy weight materials piled together.The lift ... foot is up to 20mm, suitable for stitching the eatra heavy-weight materials. The sewing area is up to 404mm, ... increase the sewing efficiency.Suitable for stitching all the extra heavy-weight material, such as safety belts, tents, seatings, shoes, ...