Close-loop design: the mountain bike inner bracket wrench features a close-loop construction that limits deformation at the opening. The straight tooth profile provides high engagement and secure tightening. Practical accessory for MTB and road bikes: a reliable tool that is well suited for crank and bottom bracket work on both mountain and road bikes. Premium quality material: made from high-strength aluminum alloy, this wrench is robust and durable. It is not easy to break and provides reliable hardness for long-term use. Exquisite workmanship: matte polish and precise line cutting deliver dense biting that minimizes slipping and protects the bottom bracket from damage. Key features and benefits: - Function and performance: designed for internal bracket and bottom bracket applications with a secure fit and dependable torque transmission. - Compatibility: suitable for standard mountain bike and road bike components. - Size and handling: compact, easy to maneuver in tight spaces and during maintenance. - Durability: aluminum alloy construction combines light weight with high strength for repeated use. Use scenarios: - Home workshop maintenance: remove and install crank arms and bottom bracket components on standard MTB and road bikes for routine service. - On-the-go repairs: keep this compact wrench in your bike kit for quick adjustments or repairs during rides. - Seasonal or regular upkeep: use during routine servicing to ensure bottom brackets remain free of slippage and damage, preserving component life.