Feature：

➤ Addition of BB centering design
➤ Addition of a slimmed down black air-seal ring for better efficiency
➤ Precision variant - Single end point with V-shaped pressure pad design
➤ Added mark on the positioning lug for better recognition
➤ 60 degree.

➤ Addition of BB centering design
➤ Addition of a slimmed down black air-seal ring for better efficiency
➤ Precision variant - Single end point with V-shaped pressure pad design
➤ Added mark on the positioning lug for better recognition
➤ 70 degree.

➤ Addition of BB centering design
➤ Addition of a slimmed down black air-seal ring for better efficiency
➤ Precision variant - Single end point with V-shaped pressure pad design
➤ Added mark on the positioning lug for better recognition
➤ 80 degree.