... down, move for center, left and right moving all use electrical control. 2) Effective working width: 1600mm, 1800mm,2000mm, 2200.3) Max ... finial model or automatic double expanded model. (can choose.)9) Electrical elements are centralized controlled, this highly improves the production efficiency ... , main body is made from 12# channel board and Ø12 cold drawl steel, the length of the rail is 4500mm.3 ...