JK9100DD Direct Drive High Speed Single Needle Lockstitch industrial Sewing Machine 1. Suitable for sewing thin and medium heavy cotton, wool and chemical fiber fabrics and light weight leather stuff 2. Applicable to sewing different kinds of thin, Medium, Heavy Fabric. 3. Automatically add Lubricant. 4. Adjust needle spacking and simplicity to reverse seaming. 5. It is an excellent endurable level seaming machine.