TCT Hole Saw Set, 2-Pack of 1-3/4" (45mm) Heavy Duty Tungsten Carbide Tipped Hole Cutters for Stainless Steel Mild Steel Copper Iron Brass Plastic and More, with Titanium-Plated Pilot Drill Bits

I'm very impressed with how fast they cut compared with drilling a hole with a drill bit. I cut 2 holes 2" apart in 1/8" x 3" square tubing. Then used a hand held angle grinder to cut between the 2 holes to have a 2" access slot for running PVC pipe in the floor frame of a commercial bus. Used the same hole saw to cut through 2 layers to the outside. It's still sharp and ready for the next task.

These are NOT made to work at high speeds! Follow the directions and use the proper rpm on your drill, a little cutting oil and I cut 6 holes in 1/2" steel with no problem. It takes time at slower speed but worked perfectly. Just be patient and let it cut.

I used the 3/4" hole saw to put bores on two pieces of 1/4" mild steel. A G0704 was used, speeds at 300-320 rpm and using the fine down feed, cutting oil was used. The bores where clean, the bits cut .020 oversized with everything locked down and showed no signs of dulling. The guide drill was used. The exit side of the bore showed no signs of mangling, clean all the way through.

Bought these bits to drill into a pretty think piece of steel and it did the job. Took awhile, but mission accomplished.

This hole saw is great. It outperforms Lennox and Milwaukee. Clean cut not vibration and seems to stay sharp.

Broke one on the first use

One of the best hole saws I've ever used. But you need bigger that 4" if your making a hole for a 4" dryer pipe. Oops now I have 2, a 4" and 4.25. Measure the pipe, then buy the saw, saves you 50%

Good drills for a great price . They work as intended. No complaints.