Spacefile's SDSm Manual system is a highly flexible, cost effective solution for light and medium load applications. Efficient movement is achieved by simply grasping on to the handle and moving side to side. Designed for high traffic and heavy use, SDSm carriages are engineered to endure the toughest conditions, no matter what the application. Advanced welded frame construction provides the highest degree of structural integrity, rigidity and durability compared to any other design. Large 3" solid steel wheels enable easy maneuverability and permanently sealed/lubricated ball-bearings ensure smooth long-lasting operation. SDSm carriages are finished with powder coat paint, providing a durable, hard surface with superior performance qualities.