1,high security 2,long using life 3,easy to install ... Manual Control, which is direct control by the operator. 2. Computer Automatic Positioning System (Optional for order), which can easily ... (Derrick), easy for handling and transportation. SS100/100 has 2 types: Single-caged and Double-caged, optional for users. ... guide rail, while those the Single-caged are 2 ø51 * 4 pipes. Mezzanine used platform