Material: Made of high quality steel, durable and strong, not easy to rust, anti-corrosion. Size: Length is 5cm, top diameter is 2.3cm, base diameter is 2.4cm, square hole diameter is 1.33cm. Application: Ideal for any 20 tooth splined bottom bracket and 23mm width wrench removal tool. Installation: Use the bike crank removal tool to remove the crank after removing the bike crank puller, tighten clockwise. Wide use: It is a practical bicycle repair tool, suitable for families, bicycle enthusiasts and bicycle shops.