GSTK 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

Carbide, cutters work awesome.They cut everything i've used them on

There's another review on here where a guy says this was the best purchase he ever made. That was exactly what I was thinking. I had a person that was coming to buy a van for me. And a couple weeks back I tried to resurface my own rotors. I got lazy and never test drove the van afterwards but the day she was supposed to come by I had about 4 hours and I went to drive the van and quickly realized that that rotor was not surfaced at all. The front end was shaking. I had a choice driving an hour to the nearest auto parts shop and pay $200 for a rotors or use the rotor that is on my van that is messed up superimpose it on a rotor that I tried to buy that had the wrong lug pattern on it and drill a lug pattern out. I didn't have regular bits that were big enough to drill out the holes. So I busted out this set used a center punch and very quickly drilled out the rotors. You could tell how good these bits are because of the size of the shavings that came out. I was able to do eight holes with one four amp hour drill battery and still had life in it. This carbide bit went through 3/8 of material in about less than a minute of time. I didn't even really put oil on it to keep it lubricated either. And after the eight holes it was still cutting. This is an amazing product and it saved my butt. Thank you so much to the maker.

Cut through a stainless steel sink for a garbage disposal switch install, did so very cleanly. Would highly recomend for similar work.

Very satisfied and the price was 5 stars. Worked well on 1045 steel for a 1-3/4" diameter hole 1.5" deep in a 3" round. Of course I had to cut from each side. The first 1/2" went relatively easy considering the material. Chip clearance got progressively worse after the first 3/8". Why just 4 stars? These are metric cutters advertised as inch. The 1-3/4" is actually 45mm (1.772"). I assume all the rest are similar approximates. Does it make a big difference in my current project? No. Attached picture shows the cutter after the hole. Nothing is broken and teeth are still sharp. Also included is the plug that was removed. The finish in the hole is about the same. First 1/4" is pretty good. After that chip build up ( I cleared frequently) gave a poorer finish.

This hole saw set does exactly what tools are supposed to do: it works hard, doesn’t complain, and doesn’t require a second purchase to fix its shortcomings. The carbide cutters chew through metal and steel cleanly and efficiently, without the drama, smoke, or premature dulling you get from cheap bi-metal junk. I’ve used multiple sizes from the set and they all cut straight and fast with minimal vibration. The carbide teeth are properly attached (a low bar that many tools still trip over), and nothing feels flimsy or disposable. This is gear meant to solve a problem, not create a new one. The kit is sensibly complete — useful sizes, solid arbors, and a case that keeps everything organized so you’re not rummaging around like a raccoon in a toolbox. That matters when you value your time as much as your money. For the price, this set punches well above its weight. GSTK managed to deliver something that avoids the false economy trap: cheap tools that fail and force you to buy twice. If you want reliable performance, fewer trips to the store, and holes drilled without nonsense, this is a smart, five-star purchase.

EXCELLENT PRODUCT-- FIRST TASK WAS DRILLING THRU TWO PIECES OF 1/2 IN STEEL PLATE WITH AN 1.5 INCH DIAMETER SAW-- WENT THRU LIKE BUTTER AND LEFT A SMOOTH CUT- HIGHLY RECOMMEND USING CUTTING OIL TO HELP FLOAT OUT THE CHIPS GREAT VALUYE FOR MONEY-- AFTER CUT BIT APPEARED TO SHOW ZERO SIGNS OF MARKS OR DULLNESS

Works adequately. Nice clean cut with no walking. Not as durable as the one's offered by Hougen, but also not the nearly the cost of the Hougen.

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