Light and medium duty movable racking is equipped with only one corridor (around D1000mm). Perfect sealing, practical and looking good, security and credible, taking the best advantage of storage space. There are two types: manual and electric drive. The guide way can be either embedded in the ground or fixed on the ground. The movable shelving is fixed on the base which moves along the guide way. Each line of shelving moves easily and smoothly on the chain-wheel system, manually storing and withdrawing, widely used in archives, library, bank and company document center, electronic light industry, etc.