Drive-in racking is also known as drive through racking. It is suitable for the storage of goods at same size by large quantitles,with higher space utilization and lower cost. It has no special channel for trollys and trucks, when storing goods the forklift operates from inner side to outer side, but oppositelywhen picking, that is called first-in, last-out. The theory of drive-in racking is to link the traditional rack of many lines together without special channel.The way of installment can be put two sets of drive-in racking back to back or make one set stand against the wall, while the entrance and exit of forklifts use the same channel. Drive-in racking has good storage density but can not operate first-in, last-out. This type of racking fits for storing standard cargo units.