I am not understanding the measurments ? When you put the circle and make the dimensions 16.8 your scale changes to 8.4 with me it becomes 0.84 ?. you give the solidify modifier a thickness of 0.211 mm ? not getting it. Can you explain ?
The first number… 16.8 is the finger size. 8.4 is the width of the band. You will need to use the edit tab on the 3D viewport. If it’s not visible, put your cursor in the viewport, then press the N key. The tabs will appear or disappear. Select the edit tab and look at the lower portion of it. The size or scale will show on that tab.