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BobFish
08-30-2017, 09:54 PM
I am trying to drill through hard corals and neither concrete bit or high speed steel will touch it.....anyone drill really hard coral

kien
08-31-2017, 02:14 AM
I am trying to drill through hard corals and neither concrete bit or high speed steel will touch it.....anyone drill really hard coral

Diamond drill bit?

https://www.homedepot.ca/en/home/p.516-inch-diamond-drill-bit.1000529505.html

Tyfighter
08-31-2017, 02:38 AM
A concrete bit will drill through it if you have it on have it on the hammer setting. If you don't want to risk cracking it you would want to use a diamond bit as stated above. What type of coral are you drilling and what size is the hole?

BobFish
08-31-2017, 03:04 AM
used diamond bit, masonry bit wouldn't touch it, thanks for the replies

WarDog
08-31-2017, 03:08 AM
You're drilling coral or rock?

BobFish
08-31-2017, 07:14 AM
drilling very hard coral, some of it is softer!

whatcaneyedo
08-31-2017, 02:15 PM
Like Tyfigher said, concrete/masonry bits will work but they need to be used in a hammer drill on the 'hammer drill setting'. The size/brand/quality/condition of the bit and drill makes a difference too. They are however pretty rough/violent and wouldn't be my first choice.

There are bits for drilling through tile as well as diamond coring bits which have already been mentioned.

BobFish
08-31-2017, 04:25 PM
There are bits for drilling through tile as well as diamond coring bits which have already been mentioned.

This is what I've used