K20 ToolsK20 Tools - Keychain Hex Key Allen Wrench Multi-Tool Set - Metric 2, 2.5, 3, 4, 5, 6 mm

I added these to my key ring since I needed something to help remove my hex bolts from my bike tires if I ever get a flat on the road. these work pretty well though I would recommend putting them on a different key ring then the rest of you keys this way you can easily work with them without you keys getting in the way.

Great for carry and tightening loose Allen set screws

I am a member of the Amazon Vine program. I order new items, and then write honest, unbiased reviews of that product, along with my impressions and experiences. I am not paid for these reviews.I ordered this K20 Tools - Keychain Hex Key Metric Allen Wrench Multi-Tool Set because I love gadgets! This is unusual and unique to my experience, and I simply had to see it and try it out.Now that I have, I can see this extremely compact metric allen-head wrench set being useful for something like mounting a scope on a rifle, and then removing it when finished. This might be something you would do fairly frequently. This small allen wrench set is obviously well-made, but you could not really "crank down" on the allen head screw for semi-permanent installation. You don't have enough leverage for that.You do get two heavy "key rings" with this set of three double-headed metric allen head wrenches, so that you could change to the other key ring if you managed to bend the first one through over-enthusiasm as you tighten or loosen the screws.I would also suggest that this set of wrenches is not really comfortable to carry in your pocket, because the three wrenches cannot really lie "flat". They interfere with each other so that they stack up two or three deep, making quite a bump in your pocket. They will carry on a belt clip, or ride in your range bag, just fine.These double-headed metric allen wrenches are well made and well finished, but their use is limited, in my opinion.

Fits tight into the hex bolt. Well made.

Wow! That's the short answer to how much I'm really liking these hex drivers. Between my work and hobbies with 3d printing, it's pretty common for me to be working with metric button cap screws, and while I have no shortage of metric hex drivers from 1" and 2" driver bits to T and L shaped allen keys from ball end to flush end drivers, it's proven really useful to have a workable driver in my pocket carried on my keychain.While these will not be my tool of choice for assembly or extensive repair, these chain driver bits have saved me a fair amount of time and proven extremely convenient for on-the-spot field work where a hex driver was needed. No extra handle is needed as the included keychain is very still and can be used to help apply some extra torque leverage to move a hex head fastener. It's also a nice little fidgety toy. Is it a good general tool, no, but if you regularly deal with metric hex screws, and may not always be at a workbench when a driver is needed these can be a wonderful specialty tool to add to your collection.