plain, terry dual-use computerized sock knitting machine 72-220 needle Cylinder :3.5, ... , 4 ,4.5, 5 inch knit various sock Richrui computerized sock knitting machine (3-3/4″ plain and terry Dual ... -use)1,One main feed plus five pattern feeds.2,Possibility of 13 color plus ground or ... cam control.6,Electro-pneumatic yarn finger and cam control7,Pattern Depth up to 1,200 courses.8,Multiple stop ...