KEMPSTON 88031 Kempston Diamond Hole Saw, 1-1/8"

I must admit I was a bit hesitant to buy this hole saw considering it had no reviews and it seemed to be priced too low to be any good. I bought it because it did not need any separate pilot bit like others and it appeared to be deep enough to make it through my DIY marble vanity top where as others stated 1" max depth. When I got the bit I noticed it's build quality was not very heavy duty but I was quick to give it a try through a scrap piece of marble. I worked flawlessly! I was quite surprised! Instructions state to start at an age and work your way to vertical. I'm too much of a perfectionist to do it this way. Instead I drew up a CAD drawing of the sink and faucet holes and had a friend cut it out of 14 gauge steel with his CNC plasma cutter. This allowed me to use the templates precisely placed 1-1/8" holes to get the bit started in the right place with no chance of slipping. Worked excellently. I only needed to drill 6 holes and the bit worked superbly. In my mind this goes without saying, but just in case - make sure you keep water on it all the time and don't go crazy fast! I would recommend this bit to anyone who needs a few holes, but I would question its durability in a production shop. I would not rate this bit five stars for a production shop, but for a DIYer like me I'm extremely satisfied and happy I mad this purchase.

I had to cut two new faucet holes in a Kraus stainless sink – including through the thicker support rail. The stainless was super tough and destroyed things like the milwaukee hole dozer bits, resisted a number of burrs and abrasive dremel tips, etc.This was the tool that survived and finally did the job. It took awhile (minutes per hole), with lots of going slow, low pressure, applying cooling liquid, and backing off to let things chill out, but it got there. It doesn't matter if it's slow, as long as it's not wearing out. I'd say there's less than 15% wear after drilling these two holes, which is great, since other tools wore down to nubs without making a dent.If you need to punch a sink hole, this is the one.

I used this to cut a hole in my kitchen sink for a soap dispenser. It is porcelain followed by about 1/2” of cast iron. It worked, but it wasn’t easy. It took me about 20 minutes of work to finally punch through. Perhaps I should have switched to a carbide blade once I got to the steel layer. Anyways, after much elbow grease it did finally penetrate the sink. I noticed the bit wobbled a little, as if it wasn’t completely balanced. Wasn’t a huge deal in my case but I would be concerned if I was drilling a stone countertop.

I bought this to drill the glass of fish tanks. As soon as I opened it I discovered a flaw. Its visible on the photo at the 3 o'clock position. While small, it is a diamond blade that cuts glass based on friction. It has worked, but it has caused a few chip outs as it cuts through and some less that ideal cuts in the glass, but again, its a hole. The fitting that passes through the hole has covered up all but one of the tasks I have drilled so far (5 total). If you are looking for a cheap, but effective hole saw this is acceptable. What I received may have been a fluke. I will buy one again, it works for my needs with an acceptable rate of failure.

A customer of mine bought a custom bathroom vanity top, and it came without a hole for the faucet!! They had waited about 2 months for the top to arrive, so I bought this bit and used it to drill out the hole. It worked great and took about 20 seconds to drill a nice smooth hole.

work for Waterdrop RO Reverse Osmosis Water Filtration System installation. The granite hole is big enough for RO.

The bit worked great for what I needed....good price ...

It cut nicely through quartz. Cut 2 holes with it. Seems like it could handle another couple holes in the future. I’ll hang onto it.

Good product, did the job and seems to be well designed and constructed for years of use. Very handy to have the included internal sponge for water lubrication and cooling. Squared shoulders bite aggressively and if not careful could chip edges of your cuts

Stayed sharp after 6 holes through 7/16 hard tile. It took about 3 minutes at 600 rpm in hammer mode with moderate pressure to cut through 7/16 tile.

Works greats

Worked well, took long but i took my time as it was a diy job

The tool looks nicely made and finished but upon closer inspection I noticed the tube that the diamonds are attached to is oval and not round.Tried to fix in my vise and made it a little better but am afraid the tube might break. Obviously no quality control. Thought I was getting a quality tool for the price.I