8 INCH SET OF 4 CASTERS: This set (4 swivels and 2 with brake) features swivel and lockable along with 8 inch diameter knobby tread wheel to allow you to lock the wheel spin & position while to transport a heavy load with minimal effort even over rough terrain. PREMIUM QUALITY: Constructed of solid molded rubber tire and thickened galvanized steel bracket & mounting plate and come with a sealing ring for industrial strength and durability, which can provide a 3000 lbs load capacity with 750 lbs per wheel. WIDE APPLICATION: These heavy duty casters can be used in industry, schools and residence, outdoor and indoor, dolly, shop, garage and more place to meet your needs for rolling cart/ cabinets/ bench/ box/ table and so on. QUIET & SMOOTH MOTION: Rubber wheels will make little noise when rolling even on sidewalks plus double ball bearings used offer you 360-degree rotating.