Durable Material: The bike crank puller is made of high quality carbon steel material and is made stronger by quenching process, which will not damage the crank thread and is durable for long term use. Size: Each crank puller measures approximately 8 x 2.4 x 2cm/3.15 x 0.94 x 0.79inch. It doesn't take up much space, so it's very convenient to store or take outside. Application: This crank puller is used to remove the crank arms from the bottom bracket, the head of which is removable allows it to adapt to the tapered type, ensuring a wide range of applications Professional Tool: This crank puller is used to remove the crank arms from the bottom bracket. All you need is a 5/8 or 16mm wrench or just an adjustable wrench. Note: The data is all measured manually, please allow 1-3cm error due to light and display differences, there may be color difference, please refer to the actual item received. D