... dual-use computerized sock knitting machine 72-220 needle Cylinder :3.5, 3.75, 4 ,4.5, 5 inch knit various sock Richrui computerized sock knitting machine (3-3 ... 13 color plus ground or the same course.3,Drumless,fully electronic control system4,Exclusive inner cam block system for high ... )11,Available in 220/380/415V.3phase 50/60HZ.12,Fully A.C Servo motor adopted.13,Minimized and easy operating ...