... gear rack,Nylon Rack for sliding gate operator,plastic gear rack,cnc gear rack,Gear rack for sliding gate, Gear rack for window opener ,Gear rack for openning window ,Steel gear rack for ... 11X30, M4 12X30, M4 20X20, M4 22X22 etc. All is steel material galvanized.For one meter length M4 8x30, M4 9X30, M4 ...