Never receive this product, and never confirm receiving but there is message that is confirmed by myself. Couldn`t open dispute before purchase protection expiration, because dispute was blocked. After purchase protection run out my dispute is refused. Maybe is not seller guilt , maybe is Aliexpress issue but I pay 6.17$ and I am completely unsatisfied . That`s why only one star.
I have not tried this step/uni-bit yet but it appears to be in order. Make sure to always use a quality cutting oil like rapid tap to keep your bits lasting longer. Thanks.