HSS Hole Saw Kits for Metal, Rocaris 23 pcs High-Speed Steel Hole Saw Cutting Kit Drill Bits Opener Cutter Tool for Stainless Steel,Copper, Iron 16~100mm

I only use for very light metal and some wood so they are not used on heavy metal near their ratings. They are great for the price for my needs.

Carbide section working fine. The pilot bit in the middle is so brittle that it breaks almost every time. No doubt what I got is defective. Sent a message to the company to give them a chance to at least answer my complaint. No response. DO NOT BUY.

I used these hole saws to drill 18 gauge sheet metal. You have to have a little patience when drilling but they cut a nice clean hole. Good value for the money. Does a much better job than a bimetal hole saw.

Not bad but you get what you pay for. The spring and center pilot hole drill bits included are absolutely worthless. The drills weren't even hardened. The center drill literally melted after about 2 seconds on the first hole I tried to cut. I've used a lot of cheap import drill bits and I've never seen any this bad. Luckily the set screw makes it easy to remove them and replace them if you need the pilot. The second quality issue is that the teeth don't appear to be finish ground after they are brazed in. Effectively they make a bunch of teeth and braze them in, the tooth ends up where it ends up. This results in the final hole size each saw cuts being pretty poorly controlled. The ones I checked ranged about +/-0.75mm in dia from what the hole saw was advertised as. Aside from that these saws worked pretty well cutting through stainless sheet metal and look no worse for wear.

Good for one use. Either fell apart, broke, or simply wore out after one use. Not worth it

Just drilled a 60mm hole on a 1/8 inch hot-roll steel plate. Took me about 5 minutes to drill through with enough cooling oil. Worth the money for sure. Expect a good durability too.

Excelente

Very first hole on hole saw contact the drill bit snapped, lowes craftsman went dull after 8 holes but never broke