High helix drill bits for injections


Well-Known Member
I've tried "regular" bits and things worked just as well as the high helix. The key is using sharp bits. It is easier to throw away a $1.50 bit when you think it is starting to get dull (OK...confession time: I haven't thrown them away. If you need a fist full of modestly sharp 3/8" bits if you want them!).

Midwest Arborist Supply has 15/64" for a good price: https://www.midwestarboristsupplies.com/product/high-helix-drill-bits/

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