WHEEL MATERIAL: Polyurethane Solid. the wheel and the core is one mold - Makes it super heavy duty, an Amazing 500LB Capacity Per Caster Wheel. The Front Brake locks the wheel.QUALITY: These wheels are made of precision molded solid polyurethane These polyurethane wheels offer easy roll-ability, floor protection, non-marking and non-conductive performance. Polyurethane resists most chemicals, oils and rejects floor debris. Our industrial wheels are ready for your heavy duty project.FEATURES: These Low Profile Caster Wheels give you the ability to Carry items of very heavy capacity while staying low profile.HEAVY DUTY BEARINGS: Steel structures body is extremely hard wearing and resistant to dirt, Bearing Heavy Duty.DUAL LOCKING BRAKE: The total locking brake locks both the wheel and the swivel.SPECIFICATIONRotate 360 degreesSmooth and Silent and SturdyFront Brake locks the wheelCapacity: 500lbs each caster wheelPlate Size: 2.6"(68mm) x 3.7"(95mm)Hole center to hole center: 1.7"(43mm) x 2.8"(71mm)Mounting hole dimensions: 0.47"(12mm) x 0.35"(9mm)Overall Height: 3.5"(90mm)Caster Wheel Diameter: 2.5"(65mm)Caster Wheel Width: 1.5"(40mm)Caster Wheel Material: PolyurethaneCaster Wheel Color: BlackBall bearings: Double ball bearingsPACKAGE INCLUDES4 x Caster Wheels (2.5 Inch with Front Brake)