Gravity Roller Conveyor
This is probably the most cost-effective way of handling unit loads, be it in a production or storage application.The initial start-up cost is low and minimal gravity rollers are an ideal solution where space is a premium and product can be moved easily.  
 
Gravity sections can also be mounted on wheels to allow the units to be moved in and out of vehicles. These units are excellent for handling boxes, totes and low grade cartons. They have self tracking features that allow the carton to follow the path of the conveyor, which also can be adjusted for height and stabilised by lockable casters. This type of conveyor is ideal for warehouse operations.