HSS Hole Saw Kits for Metal, Rocaris 13 pcs High-Speed Steel Hole Saw Cutting Kit Drill Bits Opener Cutter Tool for Stainless Steel,Copper, Iron 16~53mm

Solo hubo un producto que salió frágil las cierras copas

Haven't used yet but pretty mean looking.

My god are these puppies awesome.I’ve been using them in an m12 Milwaukee drill. For those of you who don’t know, the m12 doesn’t have quite the speed or torque no matter what Milwaukee claims, however the are awesome and just got better. I bought this set purely for the 24mm holesaw but figured I’d find uses for the rest.I’ve drilled about a dozen holes with every bit to test them and they have held up fine for the most part. And some are close enough that they can be used for conduit fittings as well.Pros:1)sharp as hell2) many arbors if you only using a few specific sizes you’ll have extras3) extremely nice cuts, very little burring4) spring ejection of hole being cut5) cut through a stainless plate without over heating and discolouring the plateCons:1) metric sizes, which is weird, doesn’t fit most holes you’d use as an electrician2) springs are weak, don’t stay on bits, but haven’t been needed when tried without3) holesaw stems to get stuck on arbor due to no system to keep them from getting too tight4) very shallow. Not good for boring through deep wood5) no 22 mm bit, had to buy separatelyI was not offered any kind of discount or free product. This is my unbiased opinion I love these bits

My project was drilling some ventilation holes in a 12 gauge sheet, I just needed enough to let air pass through so dimensions were not critical. I just don't own a plasma cutter like my fancy friends.The carbide teeth are really good at cutting, and held up very well. They really cut. The secret with carbide is you have to run them a good bit faster than you do steel tooling to keep them happy, and use less pressure. They'll absolutely get through 12 gauge steel in a heartbeat.The downside is that these tools are basically just castings that are cleaned up a bit and concentricity is something that was left as an exercise to the end user...that is, you get a lot of exercise trying to hold these things still when they're vibrating all over. They are marked as e.g. "50.0 mm" but I measured runout at 1.2mm, so...hole size may vary. As I said, for me that didn't matter a bit, but if you are making something with real critical dimensions, check this.One more downside, the drill bits are low-grade high speed steel (low speed steel??) and when run at the appropriate speed for the carbide cutting teeth, the drill bits literally melt away. I had three bits snap, and two more burn up entirely. The hole saws themselves are fine, and after I replace the center bit they'll be perfectly good again. Just plan to order some extras.

If you are cutting thin sheets of steel or, better yet, aluminum, this is an ok product. I tried cutting one hole in thin steel, as shown, and the bit fell out right away, spring as well. Then the product basically disintegrated and the teeth came off. Used it for one hole and grabbed a new one ( different size) for the second hole in the other piece of metal. Same thing happened to that one. Very cheap and only good if you have a quick job with very thin metal

trae unos resortes que se caen muy facil, pero en general buen producto, funciona muy bien.

Drilling through a36 metal. A little slow but finally cuts through.

This product doesn't last long I work in construction and I use hole saws a lot especially for metal these don’t last that long especially the pilot bits it’s an ok product but feels like the material is made cheap so I really would recommend buying it

Cut very well with all needed diameters.

When the needs arises you will be glad of having it.

Surprisingly good value for money, but not a high quality manufacture. Good variety of sizes .They do the job just remember they are basically a single use bore. The carbide teeth fall offwith use after I was done the little job I needed these for I just discarded the ones I used.

Photos say it all. Might be ok if you need to cut through 1/4" mild steel a couple of times. 3/8" mild steel destroyed the bits with cutting oil being applied. Delivery was fast hence the 2 stars.

Vraiment pas satisfait ...brise en un eclair ....les dents ne font même pas un trouble et le centre pine vraiment faible .....ne dépenser pas votre argent sur ce produit