BoschHDG11 11-Piece Diamond Hole Saw Assorted Set for Hard Materials for Use Only with Machines Designed for Wet Sawing and on GFCI-Protected Circuit

I've used this brand and other brands for a lot of different projects. I can say this is a solid performing hole saw bit that performs as expected and has good longevity for the price (currently $20 for the 1/2 inch). Also is a "quick change" style bit. Lately, I've been using one to drill holes in several clay/ceramic pieces, including large pots to make drainage holes. It has drilled through 5-10 projects and is still working. Of course, longevity is dependent on the material, but overall I have found it stacks up well against other brands with proper use and technique.Be patient and don't rush for best results because too much heat and pressure will wear it down faster than it should. For best results, here are some other tips (applicable to all types of hole saw bits):1. Start at an angle to create a curved line before going vertical, otherwise your bit will move around2. Use water to lubricate the surface and drill. Reset/pump the drill every 15-30 seconds to rinse and get some fresh water under the bit3. Don't push down too hard. Gentle pressure is fine. I have not noticed extra pushing speeding anything up much, but it will eat through your bit much faster. Also ease off the pressure towards the back end to avoid splintering or shattering4. Some materials take a lot of time, so just be patient. It can take several minutes to cut through some denser materials even if they are less than 1/2 inch

We used this for a non typical situation... so our results may vary from what you will experience.We needed a 1.5" hole to install our Aquor hose hydrant. We have 4" thick limestone slab skirting around our foundation, with terracotta structural block behind it in this particular section. The previous hole for a frost proof spigot was 1". Knowing that 100yr old terracotta block and limestone can be sensitive we needed to minimize blowout, so went with a brand name vs one of the random ones listed here. The price was cheaper than a coring bit, so figured why not.(* If you need to install an Aquor* The sizing is accurate on this, so that's a positive! It does fit so that you have just enough meat left for pre-drilling holes for screws, if your in the same position as us trying to fit the fat portions of the circle faced Aquor into Masonry. Hopefully you have a newer construction home that's just a brick veneer with regular concrete and plywood framing. )[Considering a bulk of the stone was already removed, it seemed reasonable this should work effortlessly.]Despite water and keeping the diamond teeth clean by continually removing build up, pausing to allow it to cool down... it struggled. This with a Bosch Brute Drill and a Dewalt 20v XR. It started great, the diamonds seemed to loose effectiveness quickly, while in the limestone. Once it hit terracotta it was done. So longevity for us was short lived. Value for money in our particular situation, I would say no.One thing to note, it kept getting unscrewed from the arbor, this seemed odd as to remove it from the quick connect base it came with, I had to use a vise and small pipe wrench. (Both in such a mannerism to prevent tweaking it.) So if using in a place that if it untwist, you could loose it, continually check for tightness if not using the quick connect fitting.[ I ordered a 12" Bosch arbor with the SDS+ end to use with our Bulldog, however the threading spacing was different, correct size just a different thread pattern.***We used a Master Force #3 arbor with their extender so this could have been part of the problem***. It didn't fit the Spyder or Dewalt Arbors we already had.]I ended up switching to a 1.25" Lennox diamond saw to finish, It went through effortlessly, with the same arbor and extender.(I should have just bought one specifically for coring, lesson learned. If you have reinforced bomb proof/ bridge grade concrete basement walls... 100% just get a coring hole saw. We have two others to install that go through limestone and extra strong concrete with #11 & #14 rebar... we won't be using this hole saw. 😂)If you're using this for thin material you should be fine. I do not recommend using this on porcelain tiles though! Get a continuous diamond coated edge vs teeth.

I had to cut some holes in 3/8" thick marble tile for a kitchen range hood. I only needed to drill 6 holes, so I am unsure as to the overall longevity of the bit, but it worked quite well when paired with a spraybottle of water.Each hole took about 2 minutes. I used minimal pressure and let the bit do the work. It never got hot due to the water, so I imagine it would last for a few dozen holes at least. Given the cost, I wouldn't expect more than that. For what it's worth, the 6th hole drilled just as fast as the first one, so I did not observe any wear-related impact. It's easy to start the holes as long as you start at an angle and get maybe 2mm of a partial groove. You should be able to angle it straight, slowly, and continue all the way through.Lastly: although it has a quick change bit attachment, I can't say I would recommend using it unless you *really* don't care about the size of hole you're drilling. With how "soft" of a hole this makes, you want to be as precise as possible. Just stick to using it in a drill with a regular chuck.

I needed a 1/2 inch hole cut in my quartz countertop. Bosch has a good reputation as a tool maker so I think this will work. I have a bit of concern as the coating doesn’t seem like it goes all the way around. I’ll try it out and hope it does the job.

I use to drill in glass,works great! Would buy again!

Enough for 8 holes :)

Bought to drill a 1/2" hole in a polished granite kitchen countertop to install a faucet for an under sink water filter. Diamond grit edge cut smooth and steady, and it removed a solid plug of granite that was just the right size. The bit showed no appreciable wear when done, and should perform well for a while. My basic DeWalt cordless drill/driver managed the job just fine.Important to follow instruction diagram to start bit at an angle to create a crescent shaped cut on the polished surface to guide the bit before tilting it up to vertical or else it may wander. Also good to have a water bottle handy to wet the bit and the cut as you proceed. This serves to keep the bit cool and to stop flyaway dust. I highly recommend this product and I would buy it again.