... Cylinder :3.5, 3.75, 4 ,4.5, 5 inch knit various sock Richrui computerized sock knitting machine (3-3/4″ plain and terry ... of error.9,Automatic re-cycling oiler,counter,and reset function.10,Attached floppy disk driver( ... Compatible with MS-DOS and WINDOWS)11,Available in 220/380/415V. ... part)11- .Any colour in heel 3-3/4" plain & terry computerized sock knitting machine