... needle Cylinder :3.5, 3.75, 4 ,4.5, 5 inch knit various sock Richrui computerized sock knitting machine (3-3/4″ plain ... 13 color plus ground or the same course.3,Drumless,fully electronic control system4,Exclusive inner cam ... control7,Pattern Depth up to 1,200 courses.8,Multiple stop motion sensors in case of error ... part)11- .Any colour in heel 3-3/4" plain & terry computerized sock knitting machine