Double deep pallet rack is similar to selective racking; but pallets are stored two rows deep instead of one row. The most common forklift used for double-deep handing is a reach truck. Double deep pallet racking stores 2 pallets deep or 4 pallets deep between aisles. It delivers increased storage density when compared to wide aisle and requires specialized fork lift trucks. Double deep pallet rack simply has one row of standard pallet racking behind another. Using a deep reach lift truck, the operator places the back pallet into the system first, and then places another pallet in front of it. Selectivity is reduced by 30% over standard pallet rack, but 30% more pallets are stored for a given number of aisles. This increases productive use of floor space over a wide aisle system, offering the same sort of utilization as narrow aisle. Double deep pallet racking offers low initial cost, high productivity, and good selectivity.