The mobile cabinets provide optimum storage space for maps and charts to prevent damage. A precision ball bearing system allows you to easily slide drawers in and out, even when they are filled to capacity, and safety stops keep the drawers from over extending. They are available in two different sizes. 1.Handle: steel-made crank handle, the structure is ratchet automatically linked,it can stop at the vertical position after the closure . 2.Transmission system: Chain:motorcycle-specific chain; Wheel :gray cast iron; Axis and short axis:cold-rolled solid round steel; Chassis: 204 double-row to the radial ball bearingsin high quality ; There's a reliable degree in the center of a straight line, so that the body frame can be balance and brisk when it sliding. Also you can move single-column or multi-column at the same time. 3.Braking devices: Each unit have the braking device, ensure personal safety; Each combination of groups have a total lock device; Theres a higher level of anti-theft capability and confidentiality. 4.Sealing devices: The contact surface of each column have a buffer and seal. A dust-proof plate on the base and an anti-rat plate onthebottom . There's no gap when you close up it. It has good function such as dust, fire, anti-rat and so on. 5.Spraying equipment: Use the most advanced automatedelectrostatic spray line