JT799-02S-250 Overlock Sewing machine Of Pocket Drim (Two-Needle Four-Thread Double-Lock Chainstitch) JT799 super high-speed overlock sewing machine of pocket brim which is specially suitable for overcoat, jacket and the inside brim of trousers pocket. it can make the interface intact and smooth, also it is firm and difficult to loose and take off, although it is very small curved outer fringe that can finish the homework of overlock brim easily.