I used a 2 1/2" core bit to drill holes for railing posts in granite (and other) boulders. It was a bear doing this with a hand-held drill, but it worked with only occasional grabbing. I used two bits to drill 13 holes four to six inches deep. It worked, but there must be a better way! No issues with the core bits themselves - I was impressed.
4 years ago
EDiamondTools has a
4.6
average rating
from
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