Juki MO-6814S - High-speed Industrial 4 Thread Overlock Stitch Serger This advanced overlock machine is easier to use and promises superior cost effectiveness. The Juki MO-6800S Series responds to various kinds of sewing materials and processes, producing delicate and beautiful soft-to-the-touch seams while further reducing operating noise as well as increasing durability. This advanced overlock machine is easier to use and promises superior cost-effectiveness as well as the responsiveness from light- to heavy-weight materials with a lower applied tension. The machine is provided with functions which contribute to easier operation. The differential-feed micro-adjustment mechanism, external increasing of the differential feed ratio and the main feed dog height can all be adjustable on the front face of the sewing machine with a screwdriver. The machine is provided as standard with functions which enable easy and best-suited adjustments according to the material to be used.responsiveness to the materials, thereby helping the operator use the machine more easily. The optimally-balanced design of the machine reduces both operating noise and vibration, contributing to more comfortable sewing work.