7- 10 mm. One size is 7- 10 mm, and there are seven sizes above 25, 32, 37, 44, 50, 58 and 75 mm. Most round bars are 58, 65 and 75 in size. You can buy these three ordinary sizes first, and then supplement the special sizes. Remember to buy a self-adhesive bag about 5 mm larger than the bar, which will be easier to install. The lever sleeve will stick to the handle, so it is best not to use it when storing it, but to use it when tying the bag.