Easily install or remove Shimano Hollowtech bottom brackets with the BIKEHAND YC-29BB repair tool, designed for precision and durability. Compatibility: Specifically designed for Shimano Hollowtech II 16-notch external bearing bottom bracket cups with a 44mm outer diameter. Versatile Fit: Also compatible with Campagnolo Ultra-Torque, FSA Mega-Exo, SRAM GXP, Truvativ, and Center Lock disc brake rotor lockrings with 16 external notches. High-Torque Performance: Features a 1/2″ drive interface, allowing it to be used with a socket wrench, ratchet, or torque wrench for precise tightening. Durable Build: Manufactured from high-quality alloy steel treated with a hardened heat process for high strength and rust resistance. Precision Grip: The 16-tooth design ensures a snug, slip-free fit that protects both the tool and the delicate notches of the bottom bracket. Compact Portability: Its mini and lightweight design makes it easy to carry in a mobile repair kit or store in a home workshop.