I've had great luck with CMT tips in the past and this one is good but seems to dull a little quicker than me. hoped. I decided to redecorate the garage and wanted to give it an industrial touch, so I built a new landing and stairs to the laundry room using ground 1/2 inch electrical wire as the stair railings. The 18mm hole is the perfect size and this piece did the trick well. However, starting at the 50th (last) hole, it was noticeably more tiring to drill the hole, even in the relatively soft woods I was using. But it was definitely worth the price because it did its job. I asked for this, and since I have a bunch of SAE Forstner bits, I'll probably never have to use that exact size again.