Unused. Product Name: SONZUIA Bicycle Bottom Bracket Removal Tool Shimano/ISIS Bottom Bracket Tool Compatible 20 Teeth Compatible Models: 20-tooth cartridge type bottom bracket tool. Compatible with Shimano Octalink, ISIS spline, Truvativ, RaceFace, FSA, etc. Compatible with oversized axles of ISIS drive and Octalink cranksets. Also compatible with some crankset lockring models such as RaceFace. Remover Tool Fixing Bracket: A device that prevents the tool from falling off when removing the bottom bracket bearing, making the work easier. Compatible with universal square hole and spline type bottom bracket bearings. Recommended Combination: Please use in conjunction with a 1/2 inch drive wrench or a 24mm open-end shifter spanner. For more secure installation, we recommend using a 1/2 inch drive wrench with a ratchet handle or a torque wrench. Professional Quality: Made of high-carbon steel and heat-treated steel, it has excellent strength and durability. ■ Specifications 【Material】High-carbon steel (heat-treated) 【Included Items】Remover tool fixing bracket