Dedicated to the Libec RT30B, RT40RB, RT50B, RT50C tripods, as well as select tripods from Sachtler, Vinten, and Manfrotto, this DL-3RB Standard Dolly offers increased mobility for repositioning your tripod and can also be used for taking dolly shots on smooth, hard surfaces. Each 3.9″ wheel incorporates its own foot-activated lock for increased stability, and the dolly supports loads up to 99 lb. Additionally, it folds for easy carrying via the integrated handle.