The size of the upper circular plate is 138mm. Under the circular plate is a circle of sliding steel balls. The plate is easy to replace by removing the middle bolt.
Strongway Machinery Mover, 17,600-Lb. Capacity, 6 Polyurethane Rollers, Compatible with Steering Arm Item# 4999991

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- 17,600-Lb. Load Capacity: Designed to move heavy machinery, equipment and large loads with confidence
- Low-Profile Design: Keeps heavy loads closer to the ground for improved stability during transport
- Heavy-Duty Steel Construction: Thick steel plate resists bending for durability and repeated use
- 6 Polyurethane Rollers: Support smooth movement across concrete and epoxy-coated floors
- Steering Arm Compatibility: Works with Strongway Steering Arm (Item# 4999991, sold separately) for added maneuverability
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