Pond Boss Forums INTRO Questions & Observations Burst the rock.

The ones that are used on the roads in Ontario here have a hole right down the center of the bit where they blow air down them to keep the tip on clean rock.

The hardest part of drilling granite is getting the down pressure on the drill. The last ones we drilled for the dock at the camp we built a wood jig to hold the drill then made a teeter totter with a 4X4 that two of us sat on. Had the drill trigger locked on and plugged the drill in remotely.