Complete junk. The boxes they come in are better made and cost more. Used this vendor's product for the first time on a customer's device. Not done right. Feathers The end of the brush is too long and does not match the shape of the anchor. When I tried them the machine flexed like crazy, now I have to disassemble the whole block AGAIN so I can resurface and trim the rebar to fix the damage caused by those sad carbon brush excuses.