Review on Industrial Masonry Drill Bits Set: Optimize Your Search by Keith Gonzales

Used a 1/4" drill bit to drill about 1" into 1930's brick. I needed 8 holes to hang a couple of mailboxes. I was advised by a friend who does commercial HVAC work (drilling in concrete, brick, and other hard surfaces as part of his job) not to use high speed and let the drill do the job while I'm not patient much Performance but decent (Porter Cable brand). I used the lowest speed and I would say it took about 15-20 minutes to drill each hole (it could have been less but I didn't really time it). I was able to drill into the brick to the correct length with no problems (other than the time it took). The bit remained intact and didn't seem to have worn much (apart from the dark coloring which is peeling off a bit) 5 runs because it worked as I hoped and as advertised. Let's see if they hold up over time.