plain, terry dual-use computerized sock knitting machine 72-220 needle Cylinder :3.5, 3.75, 4 ,4.5, 5 inch knit various sock Richrui ... sock knitting machine (3-3/4″ plain and terry Dual-use) 1,One main feed plus five pattern feeds.2,Possibility of 13 color ... .5,Stepping motor for elastic yarn and stitch cam control.6,Electro-pneumatic yarn finger and cam control7,Pattern Depth up ...