Feature:HIGH QUALITY DUAL LOCKING- Lock both rolling and swiveling.Made of non-marking polyurethane rubber, these caster wheels are very quiet while rolling, and absorb shock and vibrations. Ball bearing and dual locking bring a max loading capacity and safety.MAX FLEXIBILITY AND SAFETY- Swivel casters rotate 360 degrees which makes turning the mating equipment possible. It’s good for transporting furniture and displays quietly and safely.HEAVY DUTY BEARINGS- Steel structures body is very wear and dirt resistant, 3000 lbs capacity for the pack of 4. With anti-rust treatment, you don’t have to worry even if you use it outdoors.UNIVERSAL USE- The casters wheels have a variety of applications Including: Display and Exhibition Equipment, Mobile Worksta.