Usage Tips:EASY TO OPERATE: The retractable caster is different from ordinary casters in that it is side-mounted. It is very easy to use, just put your foot on the pedal and to lift it while operating, then if you lower the workbench, you just need to lift the pedal. IMPROVED MATERIALS: Workbench casters are constructed of solid steel and high quality PP casters. Brackets have thicker steel and stronger screws. Maximum load capacity is 700LBS MOBILITY and STABILITY: Retractable casters provide both mobility and stability. They can easily move workbench or equipment when needed, and then lower it to lock it firmly for stability, making it a versatile castor for a variety of applications. VERSATILE APPLICATIONS: These casters are used in a wide range of applications, including furniture, workbenches and other equipment, where the ability to switch between mobility and stability is essential. 360-DEGREE CASTERS: The workbench casters equiped with 360-degree swivel bracket, the casters wheels can turn to any directions. Color:Black Material:PU+Metal Package Contents: 2 * Heavy Duty Casters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.