3-1/2"plain 72-168 needles Cylinder :3.5,3.75, 4, 4.5,5 inch knit various sock Max speed: 320rpm 3-1/2"plain computerized sock knitting machine Feature: 1,One main feed plus five pattern feeds.2,Possibility of 13 color plus ground or the same course.3,Drumless,fully electronic control system4,Exclusive inner cam block system for high speed.5,Stepping motor for elastic yarn and stitch cam control. ...