- Customer order.
- Special order form for shape or specification, material and bolt of inner and outer wheels according to customer's desired form

- The inner and outer wheels are in one shape.
- Installation error is small when using one-piece type.
- High precision, high rigidity type, can obtain stable rotation accuracy.

- The outer wheel is separated and the inner wheel is rotated.
- When in use, it is used where the rotation accuracy of the inner wheel is required.