Mollom Heavy Duty Carbide Hole Saw, Hole Cutter cuts Stainless Steel, mild Steel, Iron, Copper, Brass, Plastic (3 76mm)

Bought two, and both drill oversized. One drills 0.20 oversized and the second drills 0.30 oversized. If you are drilling say a bolt hole, it’s a really sloppy fit. The quality of build was fine, but the accuracy wasn’t.

Product was as advertised

Got the job done 8 holes in 3/8 steel plate

I havent used these yet but they appear to be a quality product. I will repost when I have cut the first hole.

Got the job done

They work great.

I used my 21mm hole saw to drill 16 holes through 3/4” thick steel plate. Eight were set up and drilled on a Bridgeport mill. Eight were drilled by a cordless drill in the field. I did not notice wear or loss of performance at 16 holes. The pilot bit overheated since it drills faster than the hole saw. For thicker material, I recommend through drilling a pilot hole the same diameter, so the pilot bit can act as a guide and not have to work so hard.

Awsome holesaw need a very powerful drill and a strong grip and lots of oil

These hole saws are amazing. Quickly makes holes in thicker steel.

Granted it was just aluminum, but I had to cut through some half inch stock. This thing cut like it was butter. No Chatter, grinding, wobbling, binding, smoking, burring, or chipping. I was impressed.