... thread-up,vertical rotating hook sewing sp:1800r,p,m suitable for heavy material,tent Detailed Product ... thread-up,vertical rotating hook sewing sp:1800r,p,m suitable for heavy material,tent. Double ... convenient. The specification:1.Max sewing speed: 1800r. p. m2.needle bar stroke: 33.6mm3. needle gauge ... feel free to contact me,Jojo.I'll be happy to give you best offer and excellent service. double ...