Using this tool is easy. First, if you're working on Sram or Race Face cranks, align the tool with the 16mm hex hole of the self - extracting one - key release cap. Then, turn the tool to remove or install the cap. When dealing with Shimano Hollowtech II systems, use it to handle the 8 - point adjusting caps. And if you need to lift the safety plate on the left - side crank arm, use the built - in hook. When using an 8mm hex wrench for seized caps, be gentle at first to avoid damage. For maintenance, keep the tool clean after each use. You can wipe it with a dry cloth. Store it in a dry place to prevent rusting. This way, your tool will last a long time and keep performing well.