This product is measured with a caliper, please read carefully before placing a single!
If the pro caliper to measure the maximum outer diameter of the carbon brush cover is greater than 12mm less than 13mm, then choose 13mm brush cover!
If you use a ruler to measure the maximum positive diameter above the lid is 12mm, 12mm and 13mm are recommended to buy the lid, the pro can choose to buy 5 pairs, and note the desired size of the lid Oh! (Because the ruler measurement is likely to be 1mm less than the caliper measurement! And so on!)
1. If the product is sold without quality problems, will not support the return. As a result of buying the wrong product needs replacement, the buyer must ensure that the product does not affect the secondary sales, and bear the return shipping