... 72-220 needle Cylinder :3.5, 3.75, 4 ,4.5, 5 inch knit various sock Richrui computerized sock knitting machine (3-3/4″ plain and terry ... ,Possibility of 13 color plus ground or the same course.3,Drumless,fully electronic control system4,Exclusive inner cam block system ... -cycling oiler,counter,and reset function.10,Attached floppy disk driver(Compatible with MS-DOS and WINDOWS)11,Available in 220 ...