Seamlessly mobilize thick-walled tubing and heavy utility carts with our 3.5 Inch Bolt Hole Casters, engineered for heavy-duty central fastening. This hollow kingpin configuration accommodates custom through-bolts to bypass bulky mounting plates, integrating flawlessly into large structural pipe frames while the 3.5" wheel easily overcomes harsh workshop debris. Can’t find what you need? Contact us for guidance.