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Millner Tools Left-Handed Drill Bits

6:44
14:37
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At 6:44 in

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What happens here

Garen from Millner Tools introduces a left-handed drill bit set. He explains that traditional right-handed drill bits tend to drive a broken bolt further in because their fluting is designed for drilling. Left-handed drill bits, when run in reverse, are designed to catch and back out the broken bolt, effectively extracting it. Millner's bits are fluted only for the first 3/4 inch to maintain strength (as fluting weakens the bit) and are available in both jobber and stubby lengths. The stubby bits are designed for impact drivers, utilizing the ratcheting action to help break loose stubborn bolts, while jobber bits are for regular drills.

Goal: Extract broken bolts and screws efficiently

Tools and materials

  • Bolt Extractor Set — Alternative method for extracting broken bolts, especially after drilling a pilot hole
  • Cordless Drill Hitachi — Using with jobber left-handed drill bits
  • Impact Driver Milwaukee — Using with stubby left-handed drill bits for stubborn bolts
  • Millner Tools Left-Handed Drill Bit Set — Drilling into and extracting broken bolts and screws
  • Broken Bolt — Demonstrating bolt extraction
  • Penetrating Oil — Loosening rusted or seized bolts

What they say

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design these yes sir yep so here's our left handed drill set what a left-handed bit is going to do sure you run it in reverse so you're running it in reverse because the threading is in Reverse so a left-hand belt drill bit is nice because it's actually drilling the hole forward reverse you are actually drilling a hole but the goal while it's drilling because it's left hand thread is to hopefully because it's working the opposite direction of the of the threads is to bring it back out so you're Drilling and potentially extracting at the same time why do we want a left-handed drill bit here yeah so a traditional you know right-handed bit which I use 99 of the time because you're typically drilling is fluted in a right hand Direction so it's going to cut just like your drill bits always have well that also is the way that bolts are designed to turn so as that's drilling that's potentially impacting that bolt further down in so a left-handed drill bit is fluted in reverse and it's going to the goal will have it back that bolt out a couple of other neat features notice we only flute our bits the first three quarters of an inch reason being when you flute a bit you actually weaken that bit you're removing steel from that shake and also for those of you that have used left hand bits before you know if you're more than three quarters of an inch deep and this hasn't broken it Loose this is a solution at that point you got a three-quarter inch hole that you can take a more traditional easy out or bolt extractor and back that bolt out the other thing you're going to notice right off the get-go is you've got the jobber length plus stubby length the reason for that I've had situations before where I've had to cut a traditional bit in half to get into a tight area so let's say it's a firewall getting a don't cut ours in half we've already done it for you so you got the study length that you'll use an impact driver and you've got the jobber length which you'll use in a drill and it's a pretty dramatic difference if you notice you've got almost nine inches different so here you've got nine inches more clearance here you have nine inches more reach so if you need more reach or more clearance we give you the solution to both and then the reason we make them heck shank so they are impact ready the ratcheting that can happen when you get deeper into a hole with an impact driver can actually help break loose uh the bolt also so those are all things that will benefit and then…

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