Century Drill & Tool 74104 Cobalt Left Hand Drill Bit, 5/64"

I have to remove about a thousand screws from my deck. The screws are about 25 years old and are in pretty sad shape. Only about 30% of them were coming out with just a driver bit. The drive hole of the rest are stripped and are needing additional effort to extract them.While attempting this with a normal (right handed) bit, some of the screws were driven further into the wood when the bit caught a bite in the head. That's not the direction I wanted them to go. Using a left handed bit for screw extraction is a better solution. Although, left handed bits are more expensive than their right handed counter parts.I believe the screws have a #2 square drive hole. An 1/8" bit tends to grab the sides of the drive hole. That usually causes the drill bit to break. Even if it's made of Cobalt. So, I'm using a 7/64 and I'm attempting to shave just a few microns of metal from the bottom of the drive hole. That's enough to give the drive bit more of the shoulders to grab onto but not enough to cause the screw head to pop off.The first 100 or so screws, that I tried extracting with this drill bit, went very well. I had to apply very little pressure to the drill to remove the thin layer of steal from the drive hole. Some time around screw 100, I started having to apply additional pressure. By inspection, I could see that that cutting edges had become dull.Having said that... it's hard to tell what caused them to become dull. There was a lot of grit and debris in the drive holes. Anyone who knows anything about cutting edges will tell you that sand and grit... while they seem soft at a macro level, they are boulders in the micro arena and nothing will dull an edge faster than a little sand and grit. In hindsight, I probably should have taken care and cleaned out the drive holes before attempting to drill them out.Considering everything, this drill bit held up very well and I will likely buy more to finish the project.

I bought this as a replacement for a bit that I broke. It appears to be good quality. No issues.

Great quality item and terrific customer service. Would definitely recommend and order from Century Drill again!

I received the drill, but it broke during the middle of drillig.

This left hand drill bit is one of the most impressive examples of left hand drill bits that I have ever personally encountered. Its exquisite length and sensous flutes were almost too much of a distraction to explain. The way they turn, so evenly for the length of the bit shows an extreme level of craftmanship and attention to detail. The split point is so well presented that I am not sure if I want to risk blemishing it with use. It fits very nicely into the drill index, almost a if it was crafted just for that hole. Amazing equipment that I highly recommend!

Glass is tough to drill, requires a good product but requires skill and patience

Hard to find a tool that can you help remove a stubborn stripped screw. This one works

Bought to replace a lost bit in a snap on extractor set. Fits right in