... semi-rotary large capacity shuttle hook, suitable for sewing heavy weight materials. Used for harness, tack, saddlery, ... can sew accurately and easily several sheets of heavy weight materials piled up together.The lifting amount ... as 20mm, suitable for stitching the extra heavy-weight materials.The machine is provided with a ... Arm, Cylinder-Bed, Unison-Feed, Extra Heavy Duty, Lockstitch Sewing Machine