✔️HEAVY DUTY: Steel structures body, each caster can carry 250Lbs, a total capacity of 1000lbs(set of 4), double ball bearing, very strong and durable | ✔️FLEXIBILITY & SAFETY: Swivel casters rotate 360 degrees which make turning the mating equipment possible. 4 wheels have brakes, dual locking, ensuring the safety of people and goods at any time and any angle | ✔️SMOOTH & SILENT: Made of non-marking polyurethane rubber, these caster wheels are very quiet and smooth while rolling, safe for all types of floor including hardwood floor | ✔️WIDELY USED: The 3-inch casters can be used indoor and outdoor, such as trolleys, workbench, toolboxes, platform truck, speakers, cabinets, stands, furniture, shelves, and other items commonly found in the workshop, garage, kitchen, and office | ✔️REFUND & WARRANTY: If you are not satisfied, we'll give you a 100% refund within 60 days of purchase. 1-years warranty, quality problems, only change, no maintenance