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Bolt hole castors also referred to as bolt hole casters and hollow kingpin casters, consist of a single or compound wheel on a rotating rig used to make stationary objects movable. They are fastened to objects with compatible bolts at the bottom that fits into the caster hole. Similarly, a stem attachment may be fitted to the bolt hole to allow installation in tubes. Hollow kingpin casters are commonly used in commercial and industrial applications such as carts, furniture, trolleys, and other material handling equipment to name a few. Bolt hole casters are available in various wheel types and wheel configurations to meet various application requirements.

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