High Speed Back-twisting Machine 1,For CAT5E,CAT6,CAT7 2,Motorized take-up with ... 3,Accurrate twist distance 1,Application:Applicable for the producing of data cable, for core wire pair twisting with back ... 90% stepless adjustableMain motor3.7KW spin motor,1 inverter control,1 active pay-off,2 sets 0.75KW inverters ... constant tansion HR-DB-500/630(bobbin size) High Speed Pair Back-twisting Machine