This sturdy and durable 4-wheel swivel caster set is crafted from heavy-duty steel, ensuring stability and reliability even under high loads, with a maximum capacity of up to 600 lbs. The unique side locking brake system firmly secures the equipment in place, effectively preventing accidental slippage, and safeguarding your safety. Equipped with a 5/16 in. - 18 x 1-1/2 in. (stem diameter 5/16 in., stem length 1-1/2 in.) threaded stem, the casters offer easy installation and robust construction. The casters feature a noise-free design, ensuring a quiet and comfortable work environment. The wheels are made of high-quality, non-marring thermoplastic rubber, which is non-toxic, environmentally friendly, and resistant to most solvents. The shock-absorbing cushion design protects the floor while providing a smooth and stable rolling experience. With a 360° swivel head, the casters can respond quickly to changes in direction, making your operations more flexible and convenient. This versatile swivel caster set is suitable for various scenarios such as workbenches, instrument cases, art tables, and more. No matter where you need to enhance the mobility of your equipment, our casters can quickly meet your needs.