... production. GD-WSD,as a drugmless,double cylinder,fully electronic automatic socks knitting M ... as follows:drumless, fully automatic electronic control systemservo motor driving systemnew take-down equipment ... broken, defected needle, selector cutting, electric obstacle,.)can knot "Y" form of heel partAutomatic centrol ... specificationscylinder diameter:3 3/4'',4'',4 1/2''number of needles: 3 3/4''=120N~ ...