*Key Features *Roll Silently & Smoothly: Experience the smooth operation of a dual ball bearing design. High-quality ball bearings are integrated to resist rust and ensure quiet, effortless rolling. Let your caster wheels move smoothly and quietly, providing seamless mobility. *Heavy Lifter Alert: These heavy-duty casters feature a sturdy carbon steel bracket. The reinforced design increases strength and durability. Each caster supports up to 180 pounds, with a total load capacity of 720 pounds for the set. *Glide Like a Pro: Spin, swivel, and roll with ease. The 360-degree swivel design allows smooth maneuverability, making it easy to move office chairs or equipment across floors. *Upgrade Your Adjustment Game: Achieve stable height adjustment. Locking and unlocking is simple, allowing quick transitions between mobility and stability. Adjust as needed to suit various setups and surfaces. *Premium Vibe, Zero Trace: Made from high-quality soft PVC material, these casters are molded in one piece to prevent floor damage and reduce noise. They roll smoothly without scratching or marking floors. *Specifications Item Model Number: FJ-3C Product Size: 5.82 x 2.51 x 4.13 in / 148 x 64 x 105 mm Product Weight: 8.22 lbs / 3.73 kg Max Load Per Caster: 180 lbs / 82 kg Installation Height: 4.15 in / 105 mm Number of Casters: 4 Caster Diameter: 3 in / 76.2 mm Caster Axle Diameter: 0.35 in / 9 mm Caster Width: 1.25 in / 32 mm Material: PVC *Package Content 4 x Caster Wheels 16 x M6 Screws with Flat Washers 16 x M6 Nuts 1 x Pair of Cotton Gloves 1 x Screwdriver 1 x Wrench 1 x User Manual