... semi-rotary large capacity shuttle hook, suitable for sewing heavy weight materials. Used for harness, tack, saddlery, ... machine can sew accurately and easily several sheets of heavy weight materials piled up together.The lifting ... 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