The ID and OD in these CNC grinding tools stands for outside diameter, and inside of diameter. These variety one tool that will do both tasks, While you would need independent cylindrical grinders for this. As a general guideline, products used in slicing tools should be 2 times the hardness, https://damienklgzt.yourkwikimage.com/1437677/helping_the_others_realize_the_advantages_of_mitutoyo_measuring_tools