Load rollers is strong than normal cargo trolley, before application, please put steel plate on the floor, or via the U-bar is perfectly. Or the load rollers will hurt your normal floors. Rollers normally applied for more than two sets in the same. Strong and durable. Cargo trolley can be pulled by means of wire rope and pin connect. Load rollers in parallel connection of two or more trolleys prevents each trolled from swaying to sides. Rotating moving dolly moving direction change can be easily obtained by use of handle. Cargo trolley can be connected each other combining the large bracket with the small bracket Regarding load rollers manual instruction, moving skates applications, rollers price list, cargo trolleys pictures, transport trolleys applications, please kindly feel free contact with us. Professionally service hope will get your satisfaction. Shan Dong Finer Lifting Tools co.,LTD Skype: faithjiang888Email: sales@cargotrolley.com Website: http://www.cargotrolley.com/