Aa and Eb are the same except for their different materials, (Aa is made of steel, Eb is made of stainless steel) They are more suitable for small lathes such as 0618. Although they can also be used on lathes such as WM210v, this is not a long-term solution. If you want to use it on a lathe like WM210v, I will recommend Ec or Ed, which are specially made for WM210v. The tool holder width of Aa and EB is 50 mm (1.969? If you don't know whether it is suitable for your lathe, you can check whether the width of the square tool holder on your lathe is close to its width. Quick Change...