Unique design feature:
1. Material: SAE 52100
2. Roller: Slightly harder than bearing rings which enable for high impact load and made of material SAE 52100 with highly lapped.
3. Hardness: 58-62 HRC
4. Rolling track of rings: Highly lapped to ensure smoothness and reduce friction
5. ToleraAnce: P0 class and P6 class
