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No you cannot drill tempered glass. If your glass is tempered there isn't really any modifications that can be done to it as it will shatter. Fortunately most aquariums do not use tempered glass (though its more common on the bottom panel).
ABS is always a black plastic color. Schedule 80 will be gray. In most cases the bulk heads in the hobby are ABS. Feel free to let us know if you have any further questions!
For a ½” Sch 80 bulkhead we suggest using a 35mm glass whole saw.
You could get around 6 cuts per drill bit before the bit tends to slow down. Feel free to let us know if you have any further questions!
For acrylic you just need a plain toothed hole saw bit like the set linked below, no need for a diamond coated drill bit.
Drill bit & Bulkhead Compatibility
30mm Glass Drill bit works with our 1/2" ABS Bulkheads.
35mm Glass Drill bit works with our 3/4" ABS Bulkheads.
42mm Glass Drill bit works with our 3/4" heavy duty SCH 80 Bulkheads.
45mm Glass Drill bit works with our 1" ABS Bulkheads.
48mm Glass Drill bit works with our 1" heavy duty SCH 80 Bulkheads.
53 mm Glass Drill bit works with our 1.25" ABS Bulkheads
60mm Glass Drill bit works with our 1.25" heavy duty SCH 80, and 1.5" ABS Bulkheads.
65mm Glass Drill bit works with our 1.5" heavy duty SCH 80 Bulkheads.
75mm Glass Drill bit works with our 2" ABS Bulkheads.
85mm Glass Drill bit works with our 2" Heavy Duty SCH 80 Bulkheads.
Definitely Worth It By LogTech on 8/1/2016LogTech wouldn't recommend this product to a friendMy buddy and I have been reefing together for about 2 years now. We've cut simple tanks, 1/4" glass, but recently, I got a 220 custom tank I needed to drill the bottom for my returns and overflows. Whoever built this thing went nuts and used true 3/4" glass all around, but also inserted a true 1/2" piece of glass on the bottom, including a 1/4" polycarbonate sheet. We got the 48mm bit and went to town. Cut 5 holes through all of it and did an amazing job in the process. Probably used this thing way past its life, but it didn't seem to care.
If you need to cut some glass, use these bits.
Worked great. Reasonable price By Todd on 5/2/2016Todd would recommend this product to a friendWorked great. Reasonable price
Product does what it's designed to do By John on 4/29/2016John would recommend this product to a friendFor some reason mine cut a square. Just kidding y'all! I've purchased 3 of these hole saw bits from BRS. They work great and are perfectly priced!
Works weill..... By 787will on 4/2/2016787will wouldn't recommend this product to a friendThese work well and BRS always used to be my go to place for glass drill bits but they've recently raised the prices on these by more than 50%!!!! what gives?!?! once again it feels like members of this hobby are being taken advantage of.
Worked great for two holes By James on 2/21/2016James would recommend this product to a friendI was nervous drilling my first tank but after i did the first one i had no hesitation in the second one. It seems like it could do more holes, but now it is no longer necessary.
Works beautifully when used with care By Jack on 12/12/2015Jack would recommend this product to a friendI've only tested my 60mm bit on a scrap plate of 1/4 glass on my drill press(@500rpm), using food grade machinery lubricant. With this arrangement I was able to cut several immaculate holes with a minimum effort.
It's worth noting that the coated tip of the bit has a tendency to work itself dry of my oil based lubricant once a deep groove has been cut into the glass. I found that the bit cut far smoother if I lifted it from the groove every 5-10 seconds momentarily and allowed oil to seep back in.
Nice tool By Brent H on 12/9/2015Brent H would recommend this product to a friendUsed the same bit on 5 holes and it's still sharp
Works as advertised By Matt on 11/20/2015Matt would recommend this product to a friendBought the 60mm to drill the holes for my Synergy overflow and the bit preformed perfectly. Should be able to drill many more holes with it if need be.
Great product By Eddierg on 10/22/2015Eddierg would recommend this product to a friendEasy to use and cuts like it should
Got the job done By Bryan D on 10/13/2015Bryan D would recommend this product to a friendI am the least handy of people when it comes to figuring out how to do things, but drilling a tank was actually quite easy if you follow the BRS steps and get the right drill bit. I couldn't find this ANYWHERE locally as I needed the 60mm bit. Worked great! Clean holes. Couldnt have been easier.
Great quality By Shelley on 10/1/2015Shelley would recommend this product to a friendProduct worked great!
High Quality Bit By Bill on 9/19/2015Bill would recommend this product to a friendBit worked great and could probably drill dozens of holes