... · Single Needle,Top & Bottom Feed,Flatbed,Lockstitch Machine For Extra Heavy-weight Materials. TY-1801 Single Needle,Bottom Feed,Flatbed ... strong & durable mechanism,suitable for stitching the bulky articles & extra heavy-weight materials.· No slippage for the upper & lower sewn ... the prefect & fine seams.Suitable for stitching all the extra heavy-weight materials,such as tent,seating,buff,harness,jute ...