In terms of installation combination, it is recommended that personnel with professional knowledge carry out the installation. Thick Material Lockstitch Sewing Machine Leather Upholstery Winder Heavy Duty Us Description This Machine Adopts a Connecting Rod Type Feeding Mechanism, Stable Operation, Small Back Stitch Error, Uniform Stitch and Beautiful Appearance. It Is Suitable for Sewing All Kinds of Thin and Medium-thick Material Clothing, Fabrics, Etc. In Clothing, Knitting and Other Industries.