• Enhanced Durability: Crafted from upgraded high carbon steel, providing higher hardness, wear resistance, and a long service life
• Anti-Off Design: The professional anti-off design ensures the bottom bracket remains securely in place during installation, making the process firm and convenient
• Wide Compatibility: Features a 20-tooth design, downward compatible with 16-tooth slots, and suitable for bottom brackets up to 129mm in length
• Improved Teeth & Slots: Redesigned teeth and slots provide better protection for the bottom bracket, reducing the risk of breakage
• Versatile Application: Compatible with both square axis and spline axis bottom brackets

Specifications:

• Model: RN1881
• Material: high carbon steel + full electroplating heat treatment
• Weight: about 138g