This design differs from the SBL-A in that there are balance adjustment screws added at the trailing surface, making for added convenience in precision adjustment. Balance adjustment screw holes can be fitted with screw-in plugs (option), eliminating high frequency noise and subsequent vibration.

·Material Composition: SCM440(42CrMo4)
·Hardness: HRC48° ~52°
·Thread Precision: ISO 4H
·Parallelism: 0.002mm
·Edge Bevel: 0.002mm
·Concentricity: 0.005mm