What is Reddit's opinion of
3" Wet Drill Core Bits for Concrete and Hard Masonry, 10mm Segment Height, 14" Drilling Depth, 1-1/4"-7 Arbor, Wet Only?
From 3.5 billion Reddit comments
1 review of this product found across Reddit:
I've done DIY diamond coring of cement. Go slow and be careful. Lava rock is way softer. A 3" bit that can go 6" deep is around $75 on amazon (https://www.amazon.com/gp/product/B017JO7OVW). You can get an adapter to run it on a normal 1/2" chuck drill. I did this and choose a cordless drill I owned with variable torque settings - set it low - it will slip if you start binding, but that will save your arse. Don't use a strong drill that will bind up and toss you around. I built a guide out of plywood (using a jig saw) to help line up the hole and keep the bit from wandering - and had a helper spray water on the bit continously with a spray bottle. Worked like a charm.... You could build a holder out of plywood for the rock with a guide hole on one side.
Popular alternatives to 3" Wet Drill Core Bits for ...
Drilax Diamond Drill Bit Set 30 pcs 1mm 2mm 3mm Diamond Drill Bits 10 Pcs Each Mixed Sizes Burr Kit Jewelry Beach Sea Glass Shells Gem Stones Lapidary Compatible with Dremel 30 pcs. 1 2 3 mm (1/8")
SHDIATOOL Diamond Core Drill Bits 4 Inch for Hard Stone Concrete Marble Granite Brick Laser Welded Dry or Wet Hole Saws 102mm
