Review on CO Z Large Spiral Groove Drill by John Bailey
Requires up to a 2 3/8 " diameter hole, this is the step drill bit for use with
I hand drill holes in 2/3/4" round PVD tubing to create hydroponic systems. I can easily cut a 2" diameter hole in a round surface with this drill bit. It avoids the "bit walk" I get with flat hex bits and costs a lot less than a Forstner bit. It works great for me. It also covers various sizes up to 2 3/8. Its diameter and weight are much larger than traditional step drill bits, and it can be used on a drill press and a lathe. I will not hesitate to buy another one if needed.
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