Rotate Tools Bottom Bracket Tool 16-Notch 44mm 1/2" Drive Bicycle Repair Tool Rotate Tools Bottom Bracket Tool for bicycle maintenance and repair. This heavy-duty 16-notch socket tool is designed for installing and removing external notched bottom brackets. Constructed from durable steel with a matte grey finish, it features a 1/2 inch square drive for use with a ratchet or torque wrench, as well as a 24mm hex drive for versatility with a crescent wrench. Professional-grade tool ensuring a precise fit for bottom bracket cups to prevent slipping or damage during high-torque applications. Measurements: • Drive Size: 1/2" Square • External Drive: 24mm Hex • Notch Count: 16-Notch • Internal Diameter: Approx 44mm #Unisex