Upgrade Heavy Duty Carbide Hole Saw 14 Pcs,Metal Steel Hole Saw Drill Bit,TCT Hole Cutter,Alloy Hardness Upgrade, with 2*Extra Titanium Plated Pilot Center Drill and 2*L-Wrench

Cut through a firewall with no problem. Having a case makes it nice

I bought this to cut mainly through die-cast aluminium boxes. No problem! A friend of mine thathas worked with industrial scale cutting machines thought highly of them too.

Se facilita bastante la perforación de láminas y fierro ya que es de un material resistente y durable

I like that every circular bit comes with it's own drill bit. Not that it's needed, but I find that the drill bits tend to wear out faster than the hole saw itself and having mulitples that are interchangeable is really handy. The carrying case is almost too fancy for the bits, lol. The foam on the top of the case was nearly destroyed by the bits in transit, but honestly who cares as long as they were protected. I used it to cut through some steel in a trailer box I needed some holes in, and it worked perfectly and did as they mentioned, where it left a much more finished edge than some other hole saws I've used in the past. I did find that it could get bound up at times, so watch your wrists when drilling and don't put undoe pressure on the bit as you go, but definitely would buy again if needed.

Great product. Durable construction and reasonable price. Multiple sizes. Nice and sharp. Self ejecting spring is super nice feature. Also nice that it comes with a great little cass to keep everything organized and together. Perfect set for most jobs. Highly recommend