Material: Made of high quality steel, durable and solid, not easy to rust, corrosion protection. Application: Ideal for any 20-tooth splined bottom bracket and 23mm width wrench removal. Installation: Use the bicycle bottom bracket removal tool to remove the bottom bracket after removing the bicycle crank extractor, tighten clockwise. Wide use: It is a practical bicycle repair tool, suitable for family, bicycle enthusiasts and bicycle shops. Features: Made of high quality steel, strong and hard, durable and corrosion resistant, not easy to rust. Suitable for 20-tooth bicycle bottom bracket and square hole. Ideal choice for family, bicycle shop and bicycle enthusiasts. Specification: Material: Steel Color: Black Inner Diameter: 2.4cm Note: Due to manual measurement, please allow a small error. Thank you for your support and understanding. Tighten clockwise, loosen counterclockwise. Package Content: 1 x Bicycle Bottom Bracket Removal Tool