The Torin BIG RED TR6551-1 replacement swivel casters fit most rolling creepers, mechanic carts, shop stools, and dollies with a ball bearing design. Includes 2 swivel casters (1 pair) with a chrome-plated frame. Each caster has a load capacity of 85 lbs. and a PVC wheel measuring 2.5" in diameter. The Torin swivel casters deliver a 360-degree rotation, providing smooth and precise maneuverability. Features a threaded-post mount with square base, flush cap, and washer/lock-washer with cap nut. The top-mount post screw tightens easily. Manufactured with precision for quality and performance..